The Fein GSZ11-90 PERL Die Grinder features the 1010 watts of power consumption, 2900-9900 RPM, long and narrow neck for deep areas (grinding inside pipes), collet max of 1/4" diameter, 3-1/4" polishing disc diameter, and a 2" grinding wheel for max diameter. It also has the self-start lock, soft start, and electronic overload protection due to the KickBack Stop.