Specifications for Belt Size 384-3M-15 Cross References Numbers: 384-3M,  384-3M-15,  384-3M/15 Number of Teeth 128 *Length of Belt 384mm or ~15-1/8" Peak to Peak Distance Between Two Adjacent Belt Teeth 3mm or ~1/8" Width of Belt 15mm or ~9/16"

*Length of belt is the overall size of the belt's loop measured as if the belt were cut between two adjacent teeth and laid out on a flat surface.