Click on Pitch Sizes for complete information on pulley dimensions and sizes Pulleys, for standard belt widths Metric: T5 - T10 - T20 - AT5 - AT10 - AT20 Inch Pitch: XL - L - H - XH HTD: 5M - 8M Pulley Bar Stock Long Length material for custom machining. Metric: T2.5 - T5 - T10 - AT5 - AT10 Inch Pitch: XL - L - H HTD: 5M - 8M Custom Pulleys: Other pitch sizes. Made to Order, custom materials (stainless steel, delrin). heat treating, anodized, black oxide, Teflon coating. Please contact customer service for further information.