The Milwaukee 12" Locking Bit Holder is engineered to be the most durable, strongest locking bit holder 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 Milwaukee Shockwave Impact Duty locking bit holders feature two magnets to maximize magnetic transfer and holding power to the fastener and prevents drops. Each Milwaukee bit holder features an optimized Shockzone geometry to provide up to 3x longer life and absorb 3x more torque to prevent breakage.Find the MLW BIT HLDR LOCK 12 at Ace.