1. Straight round shank. 2. M35 high speed steel with cobalt, super hard. 3. Smooth to reduce friction, blade for fast drilling hole. 4. Wear- with long service time. 5. Perfect for drilling metals and wood, such as: aluminum, iron, stainless steel.<br><br>Suit to use with hand drill chuck, bench drill, radial drill etc. Coating: Titanium Coated Shank: Round Application: Stainless steel, steel, iron, aluminum and other metal pipes job openings. Colour:Golden Material:High speed steel Size:1.5mm 2mm 2.5mm 3mm 3.2mm 3.5mm 4mm 4.5mm 4.8mm 5mm 5.5mm 6mm 6.5mm<br><br>Package Contents: 13 x Twist Drill Bit Set<br><br>Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.