Key chuck GRAPHITE (ref. no. 56H631) for the key has an internal thread size 3/8 "x 24. Allows to fix drills with cylindrical shanks with diameter range to 10 mm. It can be installed in low power drills supplied from mains network, in cordless screwdrivers and in pneumatic drills. GRAPHITE brand offers broad range of power tools that meet expectations of professionals.