... 1. Plain bore: MXL, XL, L, H; T2.5, T5, T10; AT5, AT10; HTD 3M, 5M, 8M, 14M. ... HTD 5M, 8M,14M.3. Material: Aluminium, Cast Iron, Steel.4. Surface Treatment: Black, Phosphate, Zinc Plating, Hard anodized, ... China(Mainland).What we manufacture and where we sell:timing belt pulleys,locking assemblies,torque limiter, gear,couplings,shaft,gears ... 've been ISO9001:2000 certified since 2003. T5 timing pulleys