Hyjoy 1/2'' inch HSS M35 Cobalt Drill Bits, -Speed Steel, Pack of 5, Suitable for Steels, Cast Iron, Steels and Other Hard Metals (1/2

product and very good . Made from M35 -speed Steel and 5% Cobalt. Size: 1/2 inch, Total length: 150 mm, Work Length: 110 mm The blades are highly and they penetrate into metal efficiently. Steels, Cast Iron, Copper, Galvanized Pipe, Aluminum Alloy, Wood, Plastic and Other Hard Metals. If you to drill hard materials Full-Length Nitriding, Wear Resistance, Hardness, Spiral Design, Efficient Chip Removal .135 Tip Point Design, Boosts Speed with Self-Centering and Stops Drifting. For and Household Use, maintenance and repairs. These are for saving time Great and good , Will be good assistant in your work