For use in router tables where there is a limited router cutter shank available. 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. Increase cutter spindle length by 50 mm. Maximum tool diameter 50 mm. Maximum tool cut length 30 mm. Requires 19 mm & 22 mm A/F spanners. Accessory collet and nut sets available for other shank diameters.