Features 1、GOOD QUALITY METAL MATERIAL: Made of good quality metal material, the surface of the gear is rust proofed, which is durable 2、ACCURATE POLISHING: Gears are milled using pricing milling technology to ensure high accuracy, you can use with confidence 3、EXTENSIVE COMPATIBILITY: CJ0618 gear is compatible with micro lathes and metal cutting machines, very applicable 4、6 KINDS OF SPECIFICATIONS: there are 6 kinds of specifications for you to use, useful and practical to meet different using needs 5、GOOD WEAR AND HEAT RESISTANCE: HT250 gray iron material, possess good strength, wear resistance, heat resistance, good vibration damping, and excellent casting performance Specification Item Type: Metal Gear Set Material: HT250 gray iron Specification: Model Diameter(approx.) Thickness(approx.) Teeth T60 62mm / 2.44in 7mm / 0.28in 60 T50 52mm / 2.05in 7mm / 0.28in 50 T45 48mm / 1.89in 7mm / 0.28in 45 T40 42mm / 1.65in 7mm / 0.28in 40 T35 37mm / 1.46in 7mm / 0.28in 35 T30 32mm / 1.26in 7mm / 0.28in 30 Package List 2 x T60 Gear 2 x T50 Gear 2 x T40 Gear 1 x T45 Gear 1 x T35 Gear 1 x T30 Gear