Perfect for removing damaged or embedded screws quickly and easily. 5 x 50mm high speed steel bits. Sizes: 0, 1, 2, 3, 4. For extracting broken 5 to 12/ 6mm to 12mm screws. Suitable for use with all standard variable speed drills. Removes most kinds of screws including Phillips, and Pozidrive. Handy plastic carry is included.