Please supply drawing when you order. We can also draw for clients as their supplied specification, hole, key way and width.The material of pulley mainly is carbon steel and aluminum alloy, and also plastic. Product Specification/Models:MXL, XL, L, H, XH, XXH, T2.5, T5, T10, T20, AT5, AT10, AT20, HTD-3M, HTD-5M, HTD-8M, HTD-14M, HTD-20M, STS-3M, STS-4.5M, STS-5M, STS-8M, STS-14M.