Provides torque transmision and alignment.Cost effective coupling design.Nickel-coated Iron is good in corrosive environments. Specifications:Product Name: Universal JointSize: 35mm x 14mm/1.38 inch x 0.55inch (L*D)Bore Diameter: 6mm to 8mm(0.24inch to 0.31inch)Material: nickel-coated ironNet Weight: 50gThread Size:M4Main Color: Silver Tone Package Content:1 x Universal Joint