Festool 492524 Centrotec Countersink With Pilot Bit And Depth Stop, 4.5mm 3.5mm fully adjustable countersink drill bit with depth stop Depth stop rotates freely, eliminating burning or marring of your finished surface Save money by only having to replace the bit and not the entire assembly Long, precision milled hex shank eliminates wobble, or run out during use Fits Festool Centrotec Chuck as well as standard and keyless chucks