General description The Irwin HSS TCT tip drill bit is designed for precision drilling in various materials, including hardened steel, cast iron, bronze alloys, and manganese alloyed steel. Its Tungsten Carbide Tipped (TCT) design ensures durability and efficiency during use. Technical specifications Diameter: 2.0mm Total length: 51mm Working length: 24mm Body material: Chrome Vanadium Steel, hardened to 56 Rockwell C Tip hardness: Up to 50 Rockwell C Usage For optimal performance, it is recommended to use a coolant when drilling with TCT twist drill bits. Irwin suggests using a 3-6% emulsion, which will help extend the lifetime of the drill bit. Other information