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 percent 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 or 0.06in40mm or 1.5in18mm or 0.7in2mm or 0.08in49mm or 1.9in24mm or 0.9in2.5 or 0.1in57mm or 2.2in30mm or 1.2in3mm or 0.1in61mm or 2.4in33mm or 1.3in3.5mm or 0.14in70mm or 2.7in39mm or 1.5in4mm or 0.16in 75mm or 2.9in43mm or 1.7in4.5mm or 0.18in80mm or 3.1in47mm or 1.8in5mm or 0.2in86mm or 3.3in52mm or 2in5.5mm or 0.22in93mm or 3.6in57mm or 2.2in6mm or 0.23in93mm or 3.6in57mm or 2.2in6.5mm or 0.25in101mm or 3.9in63mm or 2.5in7mm or 0.27in109mm or 4.2in69mm or 2.7in8mm or 0.3in117mm or 4.6in75mm or 3in9mm or 0.35in125mm or 4.9in81mm or 3.2in10mm or 0.4in133mm or 5.2in87mm or 3.4in.Package List:15 x Twist Drill BitsNote:Due to manual measurement, please allow an error of 1and 8209 2mm