15Pcs Twist Drill Bit 135° Oxidized Gold Cobalt Drills Bits Set for Cutting Hard Metals Item Type: Twist Drill Bit Material: M35 High Speed Steel Containing Cobalt Drill Bit Angle: 135° Size:  Diameter (Approx.)  Full Length of Drill (Approx.) Working Length (Approx.) 1.5mm / 0.06in 40mm / 1.5in 18mm / 0.7in 2mm / 0.08in 49mm / 1.9in 24mm / 0.9in 2.5 / 0.1in 57mm / 2.2in 30mm / 1.2in 3mm / 0.1in 61mm / 2.4in 33mm / 1.3in 3.5mm / 0.14in 70mm / 2.7in 39mm / 1.5in 4mm / 0.16in  75mm / 2.9in 43mm / 1.7in 4.5mm / 0.18in 80mm / 3.1in 47mm / 1.8in 5mm / 0.2in 86mm / 3.3in 52mm / 2in 5.5mm / 0.22in 93mm / 3.6in 57mm / 2.2in 6mm / 0.23in 93mm / 3.6in 57mm / 2.2in 6.5mm / 0.25in 101mm / 3.9in 63mm / 2.5in 7mm / 0.27in 109mm / 4.2in 69mm / 2.7in 8mm / 0.3in 117mm / 4.6in 75mm / 3in 9mm / 0.35in 125mm / 4.9in 81mm / 3.2in 10mm / 0.4in 133mm / 5.2in 87mm / 3.4in