The Milwaukee 4932472068 305mm SHOCKWAVE™ Locking Bit Holder is made from custom engineered steel which makes the SHOCKWAVE™ bits more resistant to shocks from impacts. Features and Benefits - Optimised SHOCK ZONE™absorbs up to 3X more torque - Dual internal magnets ensures magnetism to fasteners - Auto-Locking - One handed bit release - Slim profile maximises access - SHOCKWAVE™ Impact Duty - Optimised for impact drivers Specifications: Packed Qty: 1 Total Length(mm):305