Malleable Iron Double Bolts Hose Clamp or called Malleable Iron Pipe Clamp has two Bolts on two ways, they werecasted with Malleable Iron, the material has fire-heating, hard and tough. It's heavy clamp, normally use industry or the pipe need strong lock. It's two types, one for American market and another for European Market. The Middel East market also need American type normally. Item: Double Bolthose clamps Standard: Amerian or European Material: Malleable Iron Bolt & Nut:Carbon Steel Threads of Bolt & Nut: Metric or as Required Surface: Zinc Coated, Yellow or Silver Size:(8-12)-(170-190) Packing: Cartons on pallet.