double universal joint: 1. Material: 20Cr 2. Specification: 3. Small order and promote delivery are accepted double universal joint: 1,Model Number W520K2,OriginalNumber 3,Specification 4,Raw Material20Cr or 20CrMnTi5,Hardness58-63HRC6,BrandYW or As customers’ Brand7,Packingplastic box for outer packing and plastic blister for inner packing, wooden box or packing as customers’ requirments8, ...