Replaces OEM: Bluebird: 0315MTD: 941-0309, 941-0310Ref No: SA204-12Toro: 104-0538, 108-7663, 251-343Fits Bluebird: Dethatchers, overseeders and aeratorsAlso fits MTD: Most snowblower auger input shaftSPECS:ID: .750"OD: 1.850"Height: .840"