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 maximise magnetic transfer and holding power to the fastener, and to prevents drops. As with all SHOCKWAVE Impact Duty accessories, each bit holder features optimised SHOCKWAVE geometry to provide up to 30x longer life and absorb 3x more torque to prevent from breakage.