Provides torque transmission and alignment.Cost effective coupling design.Nickel-coated Iron is good in corrosive environments. Specifications:Product Name: Universal JointSize: 23mm x 9mm/0.91in x 0.35in (L*D)Bore Diameter: 4mm to 4mm/0.16 inch to 0.16 inchMaterial: nickel-coated ironNet Weight: 8gMain Color: Silver Tone Package Content:5 x Universal Joint