Our Double-End drill bits are made from high-molybdenum steel for high strength and have a 135* split-point for sinking into hard metals without the drill bit "walking". The gold coating provides lubricity for easier cutting and they are heat treated by nitro-carburizing for added strength. Excellent for drilling hardened steels and stainless steel. The drill bit on both ends allows you to get at least twice the life out of one drill bit versus using multiple drill bits. Made in the USA by Norseman Drill & Tool.