The Impact Bit Holder has a thicker and stronger sidewall for longer life, but is still fully compatible with the Centrotec system. Magnetic impact bit holder, 2 3/8 inches in length. Lets you use standard bits with Centrotec chuck. 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 ï¿½ pound and the length by nearly 1-1/2ï¿½ with the Centrotec system. Additionally the Centrotec system offers a quicker way of changing bits than a keyless chuck with less run out. .