The Eastwood Pro Spotweld Cutter is a must have for every tool box. If you've ever wanted to make clean cuts without cutting into the bottom panel, then this bit is for you. This solid one-piece cutter is machined from M2 tool steel and will totally drill out spot welds with very little or no grinding required after. The self-centering point prevents "drill walking" and cuts fast. Extremely durable and long-lasting - shop tested at over 300 cuts without resharpening. The 3/8" diameter cutter applies to most applications. Drill at 700 - 2,000 RPM.