SabreCut High Performance High Quality Long Life HSS High-Speed Cobalt Spot Weld Drill Bits. These HSS M35 cobalt high-speed steel drill bits have been designed to remove a spot weld without destroying the under sheet metal. This means additional welding is not needed. The unique 120 degrees tip design on these drill bits enables the user to drill through the upper portion of the welded material allowing easier disassembly and a much cleaner workpiece saving both time and money. Specifically designed for spot weld joints and can be used at much higher speeds compared to standard HSS drill bits. Made from M35 HSS steel with 5% cobalt making these drill bits stronger and more durable so you can drill through much hardened materials.