1 pcs each size, different sizes of the most twist drill bitsExtremely high hardness, in the drilling work has processing performance, all grinding sharp ligament sticky milling work hole no burr;Sharp drill bits will make the drilling easier and more effortless, extra long allows you using these bits to drill deep holesGood toughness of materials, wear resistance, drilling . Apply to: Wood, Plastic and Aluminum Alloy MaterialPerfect For DIY, Home And General / Engineering UsingThis 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 the most drill bits. This 5 pieces twist drill set is the ultimate must have for professional users as as home DIY enthusiasts.Material: High-speed SteelColor: SilverType: Twist Drill BitDiameter: 2mm, 3mm, 3.5mm, 4mm, 5mmLength: 150mm~160mmKindly Note: When you use this drill bits, the material (eg. aluminum alloy, wood, plastic, etc) temperature will high, add some water or coolant to avoid the material smoke when using it.The speed should not be too fast, otherwise easy to smoke, charred, etc.Package Includes: 5 x Twist Drill BitsOnly 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.