Norma Torro? (European Style) Hose Clamps DIN 3017 ? Stainless Steel Band & Housing ? Zinc & Yellow Steel Screw Unique off-set non-welded de sign of the housing pro vides resistance to over-tightening damage to the hose. The short housing saddle gives a smooth under side ensuring high sealing efficiency. These clamps are original equipment on both domestic and import vehicles. They are particularly suited for fuel, vacuum, water, emission and heater hoses and can be used with silicone hoses.