These clamps are designed for heavy-duty secure hose connections, such as with exhaust hoses. They are constructed with AISI 316 Stainless Steel for the ultimate resistance to corrosion. They also feature smooth unperforated band surface and rolled edges so as to prevent hose damage. Over 20 sizes varying from 29mm up to 175mm with band spreads from 3cm to 12cm, depending on the model, will guarantee that you will find the one suited for your boat's hoses.