Hyjoy 29/64 inch HSS M35 Cobalt Drill Bits, Speed Steel,Pack of 5,Suitable for Steels,Cast Iron, Steels and Other Hard Metals(29/64inch)

product and very good . Made from M35 -speed Steel and 5% Cobalt. Size: 29/64 inch, Total length: 145mm, Working length: 100mm The blades are highly and they penetrate into metal effectively. Suitable for Steels, Cast Iron, Copper, Galvanized Pipe, Aluminum Alloy, Wood, Plastic, and Other Hard Metals. If you to drill hard metal, it is highly advised to use drill press to control the RPM. Not intended for masonry or Ceramic 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