These are the brawniest hose clamps we can find.Designed to assure proper coupling retention for large ID marine exhaust hose. T-Bolt Band Clamps offer a 360 clamping surface, and are ideal for any below-waterline application. All clamps are 316 stainless steel with 1/4" hardware. 3/4" band spreads the clamping force evenly around hose. Nylon insert nut for security. Extra long bolt fits wide range of sizes. Designed to fit Shields hose #200, 201, 210, 250, 252. Application: Exhaust hose clamp; intake hose clamp, for any below-waterline application; works with corrugated exhaust hose; full 360 clamping surface Material: 316 stainless steel (0.025" thick x 3/4"W) Hardware: 316 stainless steel; 1/4" bolt, nylon insert lock nut Fits Hose Type: Shields Series 200, 201, 210, 250, 252 hose Maximum Torque: 75 inch/lb. maximum SHIELDS# Diameter Range (Inches) mm Hose ID mmWeight (oz.)18-720-1000*1.20– 1.37 30.5– 34.8 1" 25.49.418-720-1120*1.64 – 2.02 41.7 – 51.3 1 1/2″ 38.112.518-720-20002.31 – 2.69 58.7 – 68.3 2" 50.812.818-720-21202.68 – 3.34 68.1 – 84.8 2 1/2" 63.515.618-720-30003.10 – 3.76 68.1 – 84.8 3" 76.215.818-720-31203.59 – 4.25 78.7 – 95.5 3 1/2" 88.917.218-720-40004.18 – 4.84 91.2 – 108 4" 101.618.818-720-41804.25 – 4.95 106.2 – 122.9 4 1/8" 104.818.918-720-41204.75 – 5.41