The Hitachi Koki D13VF is a heavy-duty ½″ (13 mm) corded drill featuring a 9 A motor, variable-speed trigger (0–850 rpm), and maximum torque of 416 in-lb (≈47 N·m). It accommodates key-chuck ½″ bits, drills up to 2-⅛″ (~54 mm) in wood and ½″ (~13 mm) in steel, and has a rugged aluminum gear housing for durability.