High speed steel drill bits for metal. Tapered central core minimises breakage and increases stability and durability. Speed tip allows for fast start, precise centring and guidance. Modular, stackable small tough case designed for secure storage of accessories. Clear lid for easy bit identification, removal and replacement. Bits securely lock into place. Multiple sets can be stacked together using a locking system and securely stack on top of the tough case or place into the accessory caddy for TSTAK compatible connection. No spin shank, 3 flat sides eliminates slipping in the chuck.