Most v-belt articles tell a buyer which sections exist. This one is about execution. It sets out what Z, A, B, C, D and E actually commit you to in terms of pulley groove and power range, how a code such as B-75 is read against outside length, and why wrapped, raw-edge and cogged constructions are not interchangeable at the same nominal size. The middle of the guide deals with the swap buyers get wrong most often: moving between a classical section and a narrow 3V, 5V, 8V or SP-series sheave. It closes with the tolerances, marking and documents to check on a bulk order, and the questions to put to a manufacturer before a repeat order.