Milwaukee® Hex Cap Screw measuring 3/8" - 16 X 5 1/2" is designed for 0100-20 1/4"pistol grip drill, 0200-20 electric drill/drive, 0201-20 3/8" drill, 0202-20 3/8" drill with spindle lock, 0202-50 electric drill drive, 0299-20 1/2" drill, 0300-20 1/2" drill, 0300-50 electric drill drive, 0301-20 1/2" drill, 0302-20 1/2"drill with spindle lock, 0302-50 electric drill drive, 0302-55 13 mm drill with spindle lock.