Norma Torro (European Style) Hose Clamps DIN 3017 - Stainless Steel Band & Housing with Zinc & Yellow Steel Screw Unique off-set non welded design of the house provides resistance to over-tightening damage. The short housing saddle gives a smooth underside therefore ensuring high sealing efficiency. These clamps are original equipment on both domestic and import vehicles. Best suited for fuel, vacuum, water, emission, and heater hose. In addition, they can be used with silicone hoses.