3.5mm replacement HSS Spiral Drill Bit designed to be used with the Centrotec shank. The Centrotec shank can be used with all three-jaw chucks for no-slip performance or in conjunction with Festool's Centrotec chuck system. With the Centrotec design there is a better transfer of force with no chance for bit slippage or marring of the drill bit. Reduce the weight of the drill by nearly ½ pound and the length by nearly 1-1/2” with the Centrotec system. Centrotec Spiral Drill Bit are all precision ground and polished to provide you with a compact and durable solution for drilling wood, metal and plastic. Manufactured from HSS steel, which is high quality steel that stays sharp longer. Economically packaged in 10 piece pack.