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Easy to use, and does a reasonable job on ~16/18 gauge and larger wires, but, nips smaller gauges off. Have to use the older set that I was going to throw away for the small stuff. Occasionally, on the 16/18 gauges, it takes a strand or two with the stripped cover. If I recall the description correctly, it says that the adjustment for the various gauges is automatic!
The item description says that it will work with wire gauges down to 32AWG. I use a lot of 30AWG wire so this was the reason I made the purchase. Unfortunately I discovered that this is not true, as it just slices right through 30AWG wire instead of stripping it. I had some 28 AWG and it cut through that too. It sort of works with 22AWG, but even with that, if the length of wire is short, it will pull the wire through the remaining insulation after stripping it, leaving you with a flap of insulation at the other end of the wire. I might hang onto it for doing household wiring with 12 and 14AWG cable, but its useless for small electronics work, which is what I wanted it for.
I bought this at the end of a project so it got minimal use. I had use for it again about 3 months later but when I went to cut the wire it wouldn't work. I noticed that the blade had snapped or something so it wouldn't cut. Additionally, the strippers aren't the best and I eventually went back to regular wire strippers to finish the job. I'm giving two stars because when it did work it was great but it seems pretty fragile.
I tried these wire strippers with various wires and found the gripper part of the stripper did not hold the wire to strip it. I sent it back. Shipping was great and the return was easy. I would not recommend these Knoweasy Automatic Wire Stripper and Cutter, Heavy Duty Wire Stripping Tool 2 in 1