Series Name 4 Diameter Inch 21532 Diameter Decimal Inch 24688 Series CodeSeat Size 4 Material High Speed Steel Coating TiAlN Thickness Inch 516 Included Angle 132 For general purpose applications in a variety of materials and for drilling in applications where added toughness is required such as unstable set ups on manual machines or cross hole drilling Series 14 132Deg point Series 57 144Deg point