
The Irwin TCT drill bits are designed for use in stationary machines & are suitable for drilling hard & abrasive materials such as hardened steel cast iron etc. The drill body is made from Chrome Vanadium steel, hardened to 56HRC. The carbide tip will drill hardened material up to a hardness of 50 HRC, the diamond ground 4 facet carbide tip is for easy centring & low drilling pressure. A coolant should always be used when drilling with TCT twist drill bits.