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5 mm Centrotec self-centring drill bit. The Centrotec shank is designed for use with the Festool 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. The weight of the drill is reduced and the length is reduced with the Centrotec System. Most importantly, the Centrotec system offers a quicker and more secure means of bit change than any other quick-change chuck system.