Festool Centrotec 3.5 mm Countersink Bit with Depth Stop

Festool’s adjustable countersink drill bit with a free spinning depth stop for use with the Centrotec system, as well as with all standard or keyless chucks for no-slip performance.
The Centrotec System was designed to provide a seamless transfer of force, eliminating bit slippage or marring of the drill bit. Most importantly, the Centrotec system offers a quicker and more secure means of bit change than any other quick change chuck system.