Provides torque transmision and alignment.Cost effective coupling design.Nickel-coated Iron is good in corrosive environments. Specifications:Product Name: Universal JointSize: 23mm x 11mm/0.91in x 0.43in (L*D)Bore Diameter: 5mm to 5mm/0.2 inch to 0.2 inchMaterial: nickel-coated ironThread Size: M4Main Color: Silver Tone Package Content:1 x Universal Joint