How to Choose Sheet Metal Snips and Cutters

A snip is a hand shear built to cut sheet metal and mixed materials, and picking the right one comes down to two things: the gauge of metal you’re cutting and the direction of the cut. Get those two right and the tool does the work. Get them wrong and you’ll fight the material, foul up your edge, and burn out a tool that should last decades.

Here’s the short version. Aviation snips handle tough alloys and up to 18-gauge steel, while bulldog snips are built for heavy 16-gauge stock. Multipurpose snips are ideal for medium-duty materials like vinyl, shingles, and 20-gauge steel. Tinner snips earn their keep on long, straight runs through thinner sheet. Match the type to the job and stop overthinking it.

Snip Types and What Each One Cuts

Aviation snips. The workhorse of sheet metal work. Compound action multiplies hand force 5X, which is why they cut tight curves and complex patterns without wearing out your grip. The Wiss M-series — available in left/straight cut, right/straight cut, and straight cut — covers most of what a sheet metal or HVAC crew runs into. The M3R straight-cut version is a serious tool. The new generation of Crescent Wiss snips will cut over 8 miles of steel and feature up to 10 times longer cut life than traditional aviation snips. The precision-cast molybdenum blades have CNC-ground serrations which allow for more uniform serrations that provide a cleaner cut every time.

Tinner snips. When you’re making long, straight cuts in thinner-gauge sheet, this is the right tool. HVAC and sheet metal pros agree: when making long, straight cuts in thinner-gauge sheet metal, tinner snips are the way to go. They’re a simple, economical, and durable cutting solution for many sheet metal and HVAC applications. The 13-inch Wiss WAL13SS runs lightweight aluminum and drop-forged steel with precision ground cutting edges and an adjustable pivot bolt. Dipped grips create maximum comfort and serrated lower blades provide greater material control. No spring, longer handle for leverage. These are the most durable Crescent Wiss has ever made.

Multipurpose snips. The do-everything tool for crews handling mixed materials. The 11-inch MPX5-06 and 9-inch MPC3N-06 both cut a wide range. Designed for many applications in trade work, such as cutting screening, shingles, or carpeting. Cut any direction through light-gauge metal, vinyl, leather, or other medium-duty materials, and keep cutting longer with the spring-action mechanism and non-slip textured grips. The 11-inch model goes further with a twine cutter, wire cutter, bottle opener and wire bending holes for added versatility.

Utility snips. Light shop, home, and craft work. The WEZSNIP features a serrated bottom blade that grips material as it cuts and a wire cutting notch for cutting light gauge wire. Not a sheet metal tool — a handy general cutter.

Reading Cut Direction and Gauge

Left, right, and straight cuts aren’t interchangeable, and the color-code system exists so you grab the right one fast. On the Wiss aviation line, red handles mean left cut (M1R), green means right cut (M2R), and yellow means straight (M3R). The M3R is available in left/straight cut, right/straight cut, and straight cut, and cuts straight and slight left and right curves. One smart touch on the M3R: the all-new latch design provides ergonomic single-handed operation for left or right handed users.

Gauge capacity is the hard spec — exceed it and you ruin both the cut and the tool. Match the rating to your typical stock:

Snip	Gauge Capacity	Best For
Aviation (M3R, 9-3/4”)	18 gauge low carbon steel	Curves, patterns, light steel
Tinner (WAL13SS, 13”)	Up to 22 gauge cold rolled steel	Long straight cuts, thin sheet
Multipurpose (MPX5-06, 11”)	20 gauge low carbon steel	Mixed materials, medium duty
Multipurpose (MPC3N-06, 9”)	20 gauge low carbon steel	Lighter mixed-material work
Utility (WEZSNIP, 8-1/2”)	Light wire & craft	Shop, garden, home

A few construction details worth knowing when you’re deciding what to spend. Compound action design delivers 1.5x the cutting power of traditional design on the multipurpose models. Across the line, blade serrations hold material firmly and spread cutting force uniformly across the blade edge, improving cut quality and tool life. The tinner snip’s high pivot bolt leads to longer cut life — 3X the ASME specification. And the M3R numbers are real: tested up to 500,000 cuts and engineered to require 20% less force to cut.

Rust resistance matters on Montana job sites that see moisture and freeze-thaw. The multipurpose snips run nickel chrome blades that resist rust and corrosion, and the utility snip uses stainless steel blades with a rust preventative finish. Every one of these tools carries a full lifetime warranty.

Matching the Snip to the Trade

HVAC and sheet metal. Aviation snips for ductwork curves, tinner snips for the long straight runs. A simple, economical, and durable cutting solution for many sheet metal and HVAC applications.

Roofing. Metal roofing and flashing are everywhere in this snow country, and clean cuts make weather-tight seams. Both aviation and multipurpose snips handle roof shingles and flashing — size the snip to the gauge of metal you’re running.

Siding and gutters. Lightweight aluminum tinner snips suit vinyl and aluminum work and gutter cuts. The multipurpose 11-inch also handles vinyl and gutters.

General and DIY. The multipurpose snip is the one tool that handles the grab bag — carpet, cardboard, paper, screen, wire mesh, hose, cloth and much more.

Frequently Asked Questions

What’s the difference between aviation and tinner snips? Aviation snips use compound leverage to cut curves and tougher steel — up to 18-gauge — while tinner snips are built for long, straight cuts in thinner sheet. When making long, straight cuts in thinner-gauge sheet metal, tinner snips are the way to go. Tinner snips run no spring; aviation snips are spring-loaded for fast feed.

What do the colored handles mean? On aviation snips, the color tells you cut direction at a glance. Red is left cut, green is right cut, and yellow is straight. The Wiss M3R uses yellow handles for quick identification as the straight-cut tool.

What’s the heaviest gauge a standard aviation snip will cut? Standard aviation snips top out at 18 gauge low carbon steel. For heavier 16-gauge stock you step up to a bulldog snip. Pushing past the rated gauge damages the blades and the cut.

Can a multipurpose snip handle sheet metal? Yes, up to a point. The MPX5-06 and MPC3N-06 both cut up to 20 gauge low carbon steel, plus a long list of softer materials. For tougher alloys or heavier gauge, go to aviation snips.

Are replacement blades available for tinner snips? No. Crescent does not offer replacement blades for their tinner snips, but you can refer to the warranty replacement to see if your tool qualifies for a replacement. The full lifetime warranty covers them.

Which snip is best for cutting shingles and flashing on a roof? Multipurpose snips handle shingles cleanly — they’re designed for applications such as cutting screening, shingles, or carpeting — and aviation snips handle metal flashing. Match the snip’s gauge rating to the metal you’re cutting for a tight seam.