Features GOOD QUALITY METAL MATERIAL: Made of good quality metal material, the surface of the gear is rust proofed, which is durable ACCURATE POLISHING: Gears are milled using pricing milling technology to ensure high accuracy, you can use with confidence EXTENSIVE COMPATIBILITY: CJ0618 gear is compatible with micro lathes and metal cutting machines, very applicable 6 KINDS OF SPECIFICATIONS: there are 6 kinds of specifications for you to use, useful and practical to meet different using needs 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:ModelDiameter(approx.)Thickness(approx.)TeethT6062mm / 2.44in7mm / 0.28in60T5052mm / 2.05in7mm / 0.28in50T4548mm / 1.89in7mm / 0.28in45T4042mm / 1.65in7mm / 0.28in40T3537mm / 1.46in7mm / 0.28in35T3032mm / 1.26in7mm / 0.28in30 Package List:2 x T60 Gear2 x T50 Gear2 x T40 Gear1 x T45 Gear1 x T35 Gear1 x T30 Gear 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