MLCS 9464 Router Collet Extension, 1/2-Inch Shank, Accepts 1/2-inch Shank Bits Extend your router bits an additional 2-1/4-inch 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