Snap-on has five heavy duty specialty impact sockets designed to save time and help get the job done right the first time. They are: ¾-inch Drive 12-Point ¾-inch Impact Socket (IMFDL242) for Caterpillar head bolts and Detroit Diesel main bearing cap bolts; 12-Point ½-inch Drive ½-inch Impact Socket (S6197) for heavy duty drivelines that have half-inch fasteners found on Kenworth, Peterbilt and other heavy duty applications; 12-Point ½-inch Drive ½-inch 12 mm Impact Socket (S6200) for old and new generation Detroit Diesel engine cam bearing cap bolts; ¾-inch Drive 12-Point 20 mm Impact Socket (IMMD202B) for removing the head bolts on Caterpillar engines (C7, C8, C9 and C10); and ¾-inch Drive 12-Point 17 mm Impact Socket (S6217) for head bolts on heavy duty trucks and buses with Mercedes Engine MBE900.