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)
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