SPECIFICATIONS Materials: Cast iron housing, hardened steel internals, NBR seals. Keyway Type: Square ISO male. Ratio: 2 to 6": 24:1, 8 to 10": 30:1, and 12": 50:1. Mechanical Advantage: 2 to 6": 6.72, 8 to 10": 8.1, and 12": 13.5. Weight: MGO-1T, MGO-2T, MGO-3T: 11.5 lb (5.2 kg); MGO-4T, MGO-5T: 28.6 lb (13 kg); MGO-6T: 33 lb (15 kg).