Bearing guided rebate set for straight of curved work, this set is ideal for either stationary or portable routers. The standard rebate depth is 19.1 mm (when using 12.7 mm bearing) Available as extras are different size bearing which , when fitted, will give various rebate sizes. TCT 1/2in Shank. Diameter = 50.8 mmCcuuting length = 22.5 mmRebate = 19.1mm amp; 15.9mm