Exact-Step-Drill-Bits-with-Spiral-Flute-TiAIN-Exact-07021-P-Ideal-for-burr-free-drilling-and-reaming-of-sheet-metal-pipes-and-profiles-and-manufactured-with-TiAlN-titanium-aluminium-nitride-coating-optimum-for-stainless-steel-machining-surface-hardness-approx-3000-HV-Also-features-Chamfering-deburring-zone-drilling-and-deburring-in-one-work-step-P-Exact-07021-Step-Drill-With-Spiral-Flute-TiAIN-Bore-Diameter-4-12mm