The DT70761 72 Piece drill bit set is part of the Dewalt modular Toughcase accessory range. They are stored in a Medium Connectable Tough Case compatible with the TSTAK System via the Large Tough Case. The Dewalt DT70761 Set consists of 28 Drills, 42 Screwdriver Bits and 2 Holders The DEWALT ToughCase+ Accessory Storage solutions have premium features to help keep drilling and fastening bits organized. The system includes four container sizes; the Small Bulk Storage Container, Small ToughCase®+ Container, Medium ToughCase®+ Container, and Large ToughCase®+ Container for unlimited configurations. The ToughCase®+ Containers feature newly-designed bit storage, with a unique bit bar position that allows for easy removal of bits. Clear lids let users see what's in the case .