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. Available in sizes that will not only give you the ratio you want, but will adjust the centerline measurement between your pump and crankshaft center. This will help in tight fitting conditions while allowing you to have the correct drive ratio. Moroso drive pulleys fit any 1.00" mandrel with a 1/8" keyway slot. Sold individually.