Feature:1. High Speed Steel Material: This is a twist drill with cobalt high speed steel drill bit, which is durable and has a long service life.2. Basic Specifications: The twist drill has a precise 135 bit angle, an oxidized gold finish and a round straight shank, which can prevent walking and remove chips and particles faster.3. Heat Resistance: Twist drill alloys containing 5% cobalt can improve heat resistance, especially when drilling hard metals.4. Professional Use: Twist drills are very effective in cutting hard metals such as stainless steel, cast iron, high temperature alloys, titanium alloys, hard plastics and wood.5. Satisfying Needs: Twist drills can perfectly meet your different needs and are suitable for most electric drills currently on the market.Specification:Item Type: Twist Drill BitMaterial: M35 High Speed Steel Containing CobaltDrill Bit Angle: 135Size: Diameter (Approx.) Full Length of Drill (Approx.)Working Length (Approx.)1.5mm / 0.06in40mm / 1.5in18mm / 0.7in2mm / 0.08in49mm / 1.9in24mm / 0.9in2.5 / 0.1in57mm / 2.2in30mm / 1.2in3mm / 0.1in61mm / 2.4in33mm / 1.3in3.5mm / 0.14in70mm / 2.7in39mm / 1.5in4mm / 0.16in 75mm / 2.9in43mm / 1.7in4.5mm / 0.18in80mm / 3.1in47mm / 1.8in5mm / 0.2in86mm / 3.3in52mm / 2in5.5mm / 0.22in93mm / 3.6in57mm / 2.2in6mm / 0.23in93mm / 3.6in57mm / 2.2in6.5mm / 0.25in101mm / 3.9in63mm / 2.5in7mm / 0.27in109mm / 4.2in69mm / 2.7in8mm / 0.3in117mm / 4.6in75mm / 3in9mm / 0.35in125mm / 4.9in81mm / 3.2in10mm / 0.4in133mm / 5.2in87mm / 3.4in.Package List:15 x Twist Drill BitsNote:Due to manual measurement, please allow an error of 1‑2mm