Size: HSS Co 8mm bit at 3-1/8 inch (79mm) total length, HSS Co 6mm bit at 2-1/2 inch (65mm) total length, easy to use. Durable: Special grade high speed steel cobalt mix is designed for long service life to withstand quick speed running rate and high-temperature applications. Precise Position: Nibbed pilot tip design increases accuracy and prevents slipping when held down for marking purposes. Application: Use this spot weld drill bit to separate spot welds and resistance spot welding panels without distorting the sheet metal. High Quality: Made from HSS high speed steel with CO cobalting, strong strength and high hardness, durable to use. Material:High speed steel colour:Silver Package Contents: 2 * spot weld drill bits Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.