The Fein GSZ4-90 EL Die Grinder features the 350 watts of power consumption, 3500-8500 RPM, long and narrow neck for deep areas (grinding inside pipes), max width of 8-1/4" for the neck, collet max of 1/4" diameter, 2"x3/8" polishing disc diameter, and a 3/4" grinding wheel for max diameter.