Descriptions: 1.Mode:M3(5mm/6mm/8mm/10mm/12mm/14mm/16mm) Please Leave your message in your choice，Or we will send in Random! 2.Quantity: 50 3.Meaning of "M3*5": Diameter of copper cylinder is 3mm Length of screw thread is 5mm 4.Beautiful and practical 5.Durable 6.High hardness， no deformation
