Milwaukee Locking Bit Holder 305mm Shockwave Impact Duty 1/4" Hex ShankCustom engineered steel - Milwaukee?« custom metal formula makes the SHOCKWAVE?äó bits more resistant to shock from impactingOptimised SHOCK ZONE?äó absorbs up to 3X more torqueDual internal magnets ensure magnetism to fastenersAuto-Locking - One handed bit release???Ç? Hex reception (DIN 3126 - E 6.3). Very suitable for high torque and impact applicationsTotal Length: 305 mm