Features. Cobalt bits are designed to drill hard metal such as stainless steel, cast iron, and steel. High heat resistance, means they will stay sharp longer when cutting metal. 135 deg split point for fast, easy starts split point for easier starts and more precise cutting. Last 10 times longer than standard metal drill bits. Always drill at low speed and use lubricant for longer life. Go green and recycle this productSpecifications. Diameter 7/16 in.. Product Material Highspeed steel HSS. Tool Power Drill, Drill Press. Material Usage Ferrous Metal, Wood, Plastics Fiberglass. Description Metal Wood Cobalt. Shank 7/16 in.. Length 5 1/2 in.. Weight 0.07 lbs