<p><b>Specifications:</b></p> <p>Material: HSS, Titanium Coating</p> <p>Angle Point: 135 Degree</p> <p>Flute Type: Spiral</p> <p>Shank Type: Hex Shank</p> <p> </p> <p><b>Set Includes: </b></p> <p>Retailed packaged 13 pieces twist drill bits, include 1/16"(1.59mm),5/64"(1.98mm),3/32"(2.38mm),7/64"(2.78mm),1/8"(3.18mm),9/64"(3.57mm),5/32"(3.97mm),11/64"(4.37mm),3/16"(4.76mm),13/64"(5.16mm),7/32"(5.56mm),15/64"(5.95mm),1/4"(6.35mm).  </p> <p> </p> <p><b>High Speed Steel: </b></p> <p>High speed steel construction provides ultimate durability and the titanium coating ensures a longer service life so that the drill bits last through multiple uses.</p> <p> </p> <p><b>Twist Design: </b></p> <p>The split point tip and twist design increases cutting speed while easy self centering prevents walking. Say bye to all those chips and particles, with the twist design the drill bit can quickly clears them out, and leaves a clean, smooth hole.</p> <p> </p> <p><b>Notice: </b></p> <p>Please keep cool and gentle using, the working life of the twist drill bits can be largely prolonged by proper usage.</p>