Provides torque transmmision and alignment.Cost effective coupling design.Nickel-coated Iron is good in corrosive environments. Specifications:Product Name: Universal JointSize: 24 x 11mm / 0.94 inch x 0.43 inch (L*D)Bore Diameter: 4mm to 5mm/0.16 inch to 0.2 inchMaterial: nickel-coated ironThread Size:M4Main Color: Silver Tone Package Content:2 x Universal Joint