Features 1、The male thread has uniform pitch and clear texture, high occlusion and better fastening effect. 2、Composed of pure copper, with strong wear resistance, smoothly surface and not easy to rust. 3、There are M4 x 8 mm, M4 x 10 mm, M4 x 12 mm, M4 x 16mm multiple specifications to choose from. 4、With 50pcs screws, a large number, can meet your use and replacement needs, very practically. 5、Convenient to use and with good performance, with small size, easy to carry and store. Specification Item Type: Hex Socket Screws Specification: Size: Approx. 8mm / 0.3in 10mm / 0.4in 12mm / 0.5in 16mm / 0.6in Material: Pure copper Screw Head Diameter: Approx. 7mm / 0.3in Screw Head Thickness: Approx. 2mm / 0.1in Package List 50 x Screws