Features 1、The head adopts of special grinding blade with high hardness, durable in use 2、Double back Angle processing, improve positioning accuracy, reduce cutting resistance, with longer service life; 3、Features Smooth chip removal and high efficiency; 4、Universal round and straight handle design, convenient for electric drill, bench drill, etc. 5、They are great for most drilling jobs and materials such as aluminum, wood, plastics. Specification Features: The head adopts of special grinding blade with high hardness, durable in use Double back Angle processing, improve positioning accuracy, reduce cutting resistance, with longer service life; Features Smooth chip removal and high efficiency; Universal round and straight handle design, convenient for electric drill, bench drill, etc. They are great for most drilling jobs and materials such as aluminum, wood, plastics. Specification: Material: HSS Type: straight shank twist drill Blade apex Angle: 135° Size:2mm,2.5mm, 3mm, 3.2mm,3.5mm, 4mm, 4.2mm, 4.5mm, 5mm, 5.2mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm(Optional) Package list: 1 x HSS Drill Bit Package List