Moroso black anodized Radius Tooth Pump Pulleys are designed to work more efficiently and take less power to drive your dry sump pump. These pulleys are made to use a 1.00" wide drive belt and with a wide variety of sizes, most drive ratios you may need are achievable. All dry sump pulleys are made to accept a 5/8" shaft, and come with 4 set screws to lock the pulley to the shaft. Moroso Radius Tooth Pump Pulleys are designed with the same 8mm tooth technology and will add to the efficiency of the entire round tooth drive combination.