Irwin HSS Cobalt Drill Bit

The Irwin 4.2mm HSS Cobalt Drill Bit offers precise sizing for specialist applications in stainless steel and other high alloys. This diameter is particularly useful for clearance holes where exact sizing is critical, and for technical fabrication work in demanding materials. The 4.2mm size provides specific clearance requirements for particular fixings. The drill bit body is manufactured from premium HSS steel containing 5% Cobalt, which significantly enhances the red hardness (heat resistance) and results in extended service life. This Cobalt content allows the bit to maintain its cutting edge even under the demanding conditions encountered when drilling stainless steel and other challenging high alloy materials. Featuring 135° split point grinding, this bit ensures perfect centring on your mark without bit walk, whilst reducing the drilling pressure required for clean, accurate hole placement. The industrial quality ground flute design facilitates high accuracy drilling and fast chip removal, preventing clogging and maintaining cutting performance throughout the operation. The golden tempered surface finish reflects superior heat treatment for enhanced durability and performance.