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 in 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 SHOCKWAV geometry to provide up to 30X longer life and absorb 3X more torque to prevent from breakage.