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Ask an ExpertsMilwaukee® 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.