Provides torque transmision and alignment.Cost effective coupling design.Nickel-coated Iron is good in corrosive environments. Specifications:Product Name: Universal JointSize: 18mm x 8mm/0.71in x 0.31in (L*D)Bore Diameter: 2mm to 2mm(0.08in to 0.08in)Material: nickel-coated ironNet Weight: 11gThread Size:M3Main Color: Silver Tone Package Content:1 x Universal Joint