... 3.Yellow zinc-plated. White zinc-plated. Name:Hydraulic Hose FerruleMaterial:Carbon Steel, Stainless Steel, Brass,alloy ... etc;Our main products are Ferrule, Hydraulic fittings, Hydraulic hose fittings, Hydraulic adapter, Hydrualic connections, hydraulic 3-piece suit, union tee, ... other standard fitting can be customized, OEM/ODM is welcomed. 2)Photos are only for reference. Hydraulic Hose Ferrule