Extend your router bits an additional 2-1/4-Inch. Accepts 1/2-Inch shank bits * 4-Star performance and value, says wood magazine (March 2003) * Worth a closer look says fine woodworking magazine. (December 2002) * Eliminates the dangerous temptation to withdraw the shank from the Collet * Use all diameters of 1/2-Inch shank bits safely. Use with 1/2-Inch shank routers only