The Alpen-Maykestag 0095400640100 is a Pro series metal drill bit engineered with high speed steel (HSS). The bit features a diameter of 6.4 millimeters and a length of 101 millimeters for metal drilling applications. It is ideal for drilling into materials such as stainless steel, aluminum, and metal alloys. This durable drill bit is designed to last longer and provide improved performance and accuracy that is required for professional drilling applications.