... constant2.3 Spare parts are using cylindrical structure, small but high-powerNon-carton brush electric screwdrivers structure feature3.1, Drag ... .3, Enclosure : adopt stainless steel, rusty, no magnetic conduction, high strength3.4, Stator punching: adopt annular silicon sheet, without gaps ... is cylindrical shape, enameled wire slot with higher rate Brand new TGK-BL108 full-auto Electric Screwdriver