The Taper Lock, the professional bit holder that really works; the harder you pull, the tighter it gets! It features a one-touch auto-lock for easy release of the bit with one hand. This unique patented design uses a tapered spindle to firmly hold any bit in place. It is engineered with precision to grip a hexagonal surface perfectly & also works greatwith a smooth shaft tip. Designed for 1/4" bits. Note: Insertbit not included.