This kit contains twelve mixed Torx, Pozi and Philips drive screwdriver bits. These high-quality 50mm CENTROTEC bits fit all Festool drills. notably with Festool's TXS and CXS 12V and 18V drills. The CENTROTEC fitting allows for simple and quick bit change in the Festool CENTROTEC chuck that also locks the bit in place and can be easily ejected even with gloves on for speed and efficiency. The bit cassette can be used either in the lid compartment of the Systainer or as a box on its own. All bits are 50mm in length and contain the following sizes, PZ1, PH2, PH3, PH1, PH2, PH3, TX10, TX15, TX20M TX25, TX30, TX40.