Description:Neat and uniform spiral groove design is conducive to removing crumbs and strengthening the toughness of the tap drill, which makes it have longer service life.Forged from the choice material, this tap drill has excellent performance in hardness, abrasion and high temperature resistance, and since it integrates functions of drilling, tapping, deburring, and punching in one, it is practical, labor-saving and time-saving.These tap drills are made of high speed steel, which is anti-corrosion and durable.There are different sizes of different tap drills in this set.This set is suitable for drilling carbon steel, copper and other metals.Item Name: Hex Shank Tap Drill BitMaterial: High Speed SteelDrill Specifications: 1/8-40, 5/32-3 , 3/16-24, 1/4-20, 5/16-18, 3/8-16Measurement System: British SystemHandle Diameter: 1/4 ShankSize Details:1/8-40: 67 x 3mm/2.64" x 0.12" (Approx.)5/32-3: 67 x 4mm/2.64" x 0.16" (Approx.)3/16-24: 68 x 5mm/2.68" x 0.2" (Approx.)1/4-20: 68 x 6mm/2.68" x 0.24" (Approx.)5/16-18: 70 x 8mm/2.76" x 0.31" (Approx.)3/8-16: 70 x 10mm/2.76" x 0.39" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 Set of Tap Drill Bits (6Pcs)