Dewalt dt7500 magnetic bit holder dewalt dt7500 qz this magnetic bit holder from dewalt has been manufactured with a hardened core for extra strength and durability other features include the flexible torsion zone which absorbs torque peaks and reduces breakage torsion bits only the extra grip ribs which grip the screw and reduce slipping specific bits only and tough quality professional screwdriver bits including torsion and torsion with extra grip ribs dewalt dt7500 qz magnetic bit