DeWalt 19 Piece HSS-G Cobalt drill bit set. Suitable for portable or stationary drilling of high alloy content steels and metals with a tensile strength up to 1100N/mm². Features and Benefits • 'No-walk' tip allows for easier penetration of all surfaces (5mm and above) • Cleaner, more accurate, burr-free holes due to recessed cutting wings • No slip shank; spin proof three sided shaft for optimal grip in drill chuck