Kit comes with a 32 tooth upper pulley, 16 tooth lower pulley, and a 32" Gilmer drive belt, mounting bracket, drive mandrel and belt drive sold separately, designed for alcohol and gas racing applications, Must be used in conjunction with Mandrel Drive Kit # 913-15920, 32 tooth pulley has an OD of 3.79" with a hole diameter of .63" 16 tooth pulley has an OD of 1.88" with hole diameter of 1.00".
