1.5 M Spur Gear1.Product Model : 1.5M-60T/65T2.Material : SC45#Carbon Steel3.Surface Treatment : High Frequency Quenching+Blackening4.Teeth Pitch : 4.71 mm5.Teeth Depth : 3.375 mm6.Teeth Thickness : 12 mm7.Gear Total Height : 20 mm8.Package :Spur Gear+M5*2Note:The gear is a carbon metallic product, and there could also be rust at the surface,but it will now not impact the product efficacy and use. Please understand.