Milwaukee® SHOCKWAVE™ Impact Duty™ Locking Bit Holders are engineered to be the most durable, strongest locking tip holders on the market.  The intuitive auto-locking design fits all inserts and 1/4" hex bits and the small-profile quick release collar allows for easy one-handed bit tip changes.  The new locking bit holders feature two magnets to maximize magnetic transfer and holding power to the fastener and prevents drops.  As with all SHOCKWAVE™ Impact Duty Accessories, each bit holder features and optimized SHOCKWAVE™ geometry to provide up to 30x longer life and absorb 3x more torque to prevent from breakage.