Spiral drill INOX dia. 3.7 mm HSS-E Co5 N DIN 338 135 for tough and hard materials Angle135 Diameter3.7 mm Flute length39 mm Length, total70 mm RPM from, grey cast iron, white cast iron861 RPM RPM from, hard non-ferrous metals2152 RPM RPM from, rust and acid-resistant steels861 RPM RPM from, soft non-ferrous metals2582 RPM RPM from, steels over 700 N/mm1721 RPM RPM from, thermoplastics, fibre-reinforced plastics (GRP/CRP) 1291 RPM RPM to, grey cast iron, white cast iron2152 RPM RPM to, hard non-ferrous metals4304 RPM RPM to, rust and acid-resistant steels1721 RPM RPM to, soft non-ferrous metals5164 RPM RPM to, steels over 700 N/mm2152 RPM RPM to, thermoplastics, fibre-reinforced plastics (GRP/CRP) 3443 RPM Spiral angle, from36 VersionINOX Drilling tools with cross grinding for industrial uses. Fully ground, right-hand turning versions that produce precise drill holes thanks to their high concentricity and exact centring. PFERD offers spiral drills in the STEEL (118 point angle)