... steel, carbide, M2, M35, M42 and G15 2.Straight or spiral flute Basic component materials: HSS, cobalt high speed steel, carbide ... , M35, M42 and G15Straight or spiral fluteDIN376/371 or factory standardCoating wear life than ordinary tap by 20 to 100%Customized specific ... can deal with different materials, scheduling the pieces HSS piral Fluted Tap or Sprial Pointed Tap for Deep Hole