Irwin Pro Titanium Nitride Coated Drill Bit

The Irwin IRW10502581 is a 4mm diameter HSS Pro TiN Coated Drill Bit with an overall length of 75mm, supplied individually. This versatile size is one of the most commonly used diameters for metalworking applications, making it essential for trade professionals and engineers working with steel, aluminium, and harder alloys. The 4mm diameter is perfect for standard fixings, electrical work, and general fabrication tasks. Enhanced with Titanium Nitride coating, this drill bit delivers drilling speeds 40-60% faster than traditional HSS bits whilst maintaining excellent tool life. The 135° split point grinding tip provides perfect centring and eliminates the need for pilot holes in most applications. Constructed from premium HSS steel with a 2.5µ TiN coating offering 80 HRC hardness, the bit features outstanding wear resistance. The coating's thermal properties ensure heat is diverted away from the bit, reducing power consumption and extending performance life.