These taper bored V-pulleys accommodate both classical belts, which include A, B, C, and so forth, as well as wedges, including SPB, SPA, etc. They feature a dual duty design that complies with ISO 4183. Sizes up to a 2,400-mm maximum diameter and a broad range of non-standard styles can be produced. High-grade GG25 cast iron is used in the manufacturing. For a long running life, the pulleys have phosphate surface treatment. When balanced to Q 6.3 or better, the pulleys are able to run at peripheral speeds up to 40-m/s.