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Was about to strip the spline head on my brass knob set screw when I remembered I'd ordered this. The 4-spline fit is snug with zero slop, and it reached the set screw on my top-loading cutter without any wobble. Wish I'd grabbed one sooner instead of fighting it with pliers.

Finally found a 4-spline wrench that actually grabs the set screw in the brass knob without stripping it. I've been mangling those tiny heads with pliers for months on my top loading cutter, and this fits snug with zero slop. Wish I'd bought it sooner.

Wasn't sure this would actually fit the tiny brass knob screws, but the 4-spline head lined up perfectly on the first try. Finally got the set screw tight enough that my engraving cutter stopped slipping mid-job.