Package Included:<br />1 x 14mm Twist Drill Bit<br />1 x 15mm Twist Drill Bit<br />1 x 16mm Twist Drill Bit<br />1 x 16.5mm Twist Drill Bit<br />1 x 19mm Twist Drill Bit<br />1 x 20.5mm Twist Drill Bit<br />1 x 22mm Twist Drill Bit<br />1 x 25.5mm Twist Drill Bit<br /><br />Specification:<br />Material: HSS (High Speed Steel)<br />Twist Drill Bit Length: Approx. 15cm/ 5.9"<br />Round Shank Diameter: Approx. 1.1cm/ 0.43"<br />Twist Flute Length: Approx. 8cm/ 3.15"<br />For general using drilling in wood， aluminum， malleable iron， plastic etc.<br />Material for high-speed steel 4241， higher wear resistance， toughness and bending resistance.<br />Increase the groove， chip more smoothly， drilling fast.<br />Sharp head， through a special grinding edge， to speed up the punching speed.<br />Full grinding process， the surface is more smooth， more smooth groove， processed products less burr.