Automatic magnetic docking between bit and screw ideal for repetitive screw driving spinning collar can be held in use for extra control drive conform to din 3126 c6 3 and iso 1173 please see as well optional bit holders from c k as t4504 pivot joint t4564d with locking mechanism t4564sds sds drive or standard holders of the t4570 series in 60 100 or 200 mm lengths