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Designed to assure proper coupling retention for large ID marine exhaust hose / water hose. T-Bolt Band Clamps offer a 360 degree clamping surface, and are ideal for any below-waterline application. All clamps are 316 stainless steel with 6.35 mm (1/4″) hardware. 19 mm (3/4″) band spreads the clamping force evenly around hose. Nylon insert nut for security. Extra long bolt fits wide range of sizes.