Zerostart 3100057 Engine Block Heater for Buick, Cadillac, Chevrolet, Ford, Mercury, Lincoln, Jeep, Pontiac, Continental, Oldsmobile, 1-5/8-Inch Diameter | CSA Approved | 120 Volts | 600 Watts 120 Volts/600 Watts For Buick, Cadillac, Chevrolet, Ford, Mercury, Lincoln, Jeep, Pontiac, Continental, Oldsmobile Diameter: 1 5/8in CSA Approved