The drilled holes are a little larger than standard wire gauges, but all the holes are through-plated for longevity.
Wires are available in standard wire gauges from 10 swg to 32 swg.
It comes with three tips that adapt to standard wire gauges and wrap diameters.
Wires come in standard wire gauges (S.W.G.) where the smaller the diameter of the wire the bigger the SWG. e.g 22 swg has a smaller diameter than 16 swg.
Numbers stamped beside the grooves on most strippers coincide with standard wire gauges.