Spot Weld Drill Bits are designed to effectively cut auto panel spot welds. Made of Cobalt Steel, the high red hardness permits speeds 30% greater than high speed steel spot weld drills. Cobalt Steel is substantially more abrasion resistant, resulting in a very long lasting cutting edge. Spot Weld drill bits have a spur point, designed to cut through the weld on one panel while leaving only a slight penetration into the second panel. The modified point is chip resistant. This 6pc set includes: 1pc Single End 6.5mm, 8.0mm, 10.0mm & 1pc Double End 6.5mm, 8.0mm, 10.0mm.