The Titanium coating on this bit will help prevent the bit from dulling due to overheating. The twist is the same size as the shank which is also 8.0mm and has a flat spot on it to be tightened into our DF-15 Series Spot Weld Drills. Our drill bits a specifically designed for the abuse of spot weld drilling. Flat ground for strength, centering nib to prevent walking. Our German made spot weld bits are available in 3 sizes, 6.5, 8.0 and 10.0 mm. These Cobalt high-speed steel mix bits are 45mm long and work with all brands of spot-weld drills. Titanium (gold color) is a heat resistant coating that extends drill life by about 50%.

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