SK 6-⁠Inch High-Leverage Diagonal Cutting Pliers (SK02150) Review

The verdict

Key specs

What independent testing and the community found

• SK Tools USA — 6" Diagonal Cutting Pliers catalog page (15016). SK's own catalog still lists a USA-made, drop-forged 6-inch diagonal cutter, model 15016, with a limited lifetime warranty. So the SK02150 on Amazon is a second, lower-cost line under the same name, not the forged tool.
• Project Farm (YouTube) — 'I've Never Seen Pliers This Good!' (June 7, 2026). A June 2026 torture test of 8-inch diagonal cutters: 16-penny nail, deck screw, Allen key, leverage and hand-force measurements. It is the test SK cutters get credited with. Note what it tested: the 8-inch class, not the SK02150.
• ToolGuyd — 'GreatStar Acquires SK Hand Tool from Ideal Industries'. Documents the June 30, 2021 sale of SK to Hangzhou Great Star, the Chinese tool company that now runs SK's Amazon lineup. The manufacturer field on this listing reads 'Hangzhou Great Star Industrial Co., LTD', which matches.
• BusinessWire — GreatStar Tools USA acquisition announcement. The official announcement. GreatStar said it would keep a large share of SK's professional line in US manufacturing, in Williamsport, PA. That is why USA-forged and imported SK tools sit side by side today.
• Wikipedia — SK Hand Tools. Brand history: early-1900s origins, the 2010 bankruptcy, Ideal Industries ownership, then the 2021 Great Star sale. The century-of-heritage line on the listing checks out. Who owns the century now is the part the listing skips.

Pros and cons

What works

• Laser-hardened cutting edges, rated by SK for steel, iron and copper wire.
• A flush hot-rivet joint. Nothing sticks out of the pivot, so the narrow profile reaches into a crowded panel, and the high-leverage geometry means less hand force per cut.
• Six inches is the control size. It trades raw capacity for precision in tight spaces.
• SK backs it with a limited lifetime warranty against material and workmanship defects, per the brand's own site.

What doesn't

• This is not the USA-forged SK many buyers picture when they see the name. The listing names Hangzhou Great Star Industrial as the manufacturer. SK's drop-forged-in-USA 6-inch cutter, the 15016, is a separate, pricier tool still in SK's catalog.
• No long-term record. The model is new, and nobody has published how the edges hold up after months of daily use.
• SK publishes no maximum cutting capacity or hardness rating for this model. So it is not rated for piano wire, nails or hardened fasteners. A spec sheet that skips the number usually has a reason. The Project Farm torture results people quote came from the 8-inch heavy-duty class, not this tool.

Common questions

Are these SK diagonal pliers made in the USA?

No. The listing's own product information names Hangzhou Great Star Industrial, SK's owner since 2021, as the manufacturer of the SK02150. SK still sells a drop-forged, made-in-USA 6-inch diagonal cutter, model 15016, through its own site. Both exist under one logo.

Can they cut nails or hardened steel wire?

SK rates them for steel, iron and copper wire and publishes no maximum hardness or capacity. Treat them as electrical and general-wire cutters. For nails, screws or piano wire, use a heavy-duty 8-inch cutter or end nippers made for hardened material.

What is the difference between the SK02150 and the SK 15016?

The SK02150 is the current import line: laser-hardened edges, hot flush rivet, TPR grips. The 15016 is the legacy US-made tool: high-carbon alloy steel, drop-forged and heat treated, knife-to-knife ground edges, vinyl grips. They share the SK name and the lifetime warranty. They do not share a factory, and the 15016 is the pricier one.