6?30mm Cone Step Drill Bit Nitriding High Speed Steel Hole Cuttet for Metal Sheet

Feature: 1. 4241 high speed steel construction for high strength and long durability. 2. Nitriding surface treatment to make the drill bit harder. 3. It can drill and expand hole on iron sheet and aluminum sheet up to 2mm thick. 4. Work with electric drill, bench drill, etc. 5. Excellent quality, long service life, saving cost for you. Specification: Item Type: Step Drill Bit Material: High Speed Steel Surface Treatment: Nitriding Black Total Length: Approx 100mm 3.9in. Package List: 1 x Step Drill Bit4241 high speed steel construction for high strength and long durability. Nitriding surface treatment to make the drill bit harder. It can drill and expand hole on iron sheet and aluminum sheet up to 2mm thick. Work with electric drill, bench drill, etc. Excellent quality, long service life, saving cost for you.