This cutter is a variation of our no. 400-102 high quality, French-made Ring Cutter. Eurotool has created a 1/4" hex key attachment that can be installed in a battery powered screwdriver. Simply unscrew the retainer nut from the standard butterfly key and replace with the hexagonal key and it's ready to use with a power screwdriver (not included). Made of the finest quality steel to provide years of trouble-free service. Instructions included. Optional diamond saw is used to cut hard metals such as titanium, stainless steel, and platinum. Made in France.