For use in router tables where there is a limited router cutters shank length available. Precision machined one-piece steel body. With a 1/2 inch shank, fitted with a multi-slit spring steel collet and collet nut. Use at maximum speed 18000 RPM. Increases cutter spindle length by 50mm. Maximum tool diameter 50mm. Maximum tool cut length 30mm. Requires 19mm & 22mm A/F spanners. Accessory collet and nut sets available for other shank diameters. This product includes: 1 x Collet extension body 1 x Collet nut 1 x 1/2 inch collet