1 pcs each size, different sizes of the most popular twist drill bits Extremely high hardness, in the drilling work has excellent processing performance, all grinding ligament sticky milling work hole smooth no burr; twisted drill bits will make the drilling easier and more effortless, extra long allows you using these bits to drill deep holes Good toughness of materials, wear resistance, drilling ability. Apply to: Wood, Plastic and Aluminum Alloy Material Perfect For DIY, Home And General Building / Engineering Using This 5 pieces strong high speed steel twist drill set is Perfect for drilling most materials including Wood, Plastic and Aluminum Alloy Material. This drill set is a comprehensive set of the most popular drill bits. This 5 pieces twist drill set is the ultimate must have for professional users as well as home DIY enthusiasts. Material: High-speed Steel Color: Silver Type: Twist Drill Bit Diameter: 2mm, 3mm, 3.5mm, 4mm, 5mm Length: 150mm~160mm Kindly Note: When you use this drill bits, the material (eg. aluminum alloy, wood, plastic, etc) temperature will get very high, please add some water or coolant to avoid the material get smoke when using it. The speed should not be too fast, otherwise easy to smoke, charred, etc. Package Includes: 5 x Twist Drill Bits 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.