Set Included: 7 sizes M4 / M5 / M6 / M10 / M12 A total of 340 pieces, in a transparent box, applicable to different sizes of fasteners. High Quality Materials: Made of 65mm metal steel, brown, ridgeless, has good corrosion resistance and high temperature resistance. 7 Size: Starlock 340 part subbluucker set contains 7 most used sizes M3/M5/M6/M10/M12, all washers are packed in a strong clear plastic case and can be used for a storage box. Functional principle: A fuse disk exerts a spring force between the head of the fasteners and the substrate, which holds the hard disk against the substrate and the hard bolt thread against the mother or substrate thread, wherebyMore friction and rotational resistance. Wide application spectrum: whether it is used in machine equipment, industrial shock absorption and insulation production, your different requirements can respond on a daily basis. High quality installations, perfect for quick repairs and very simple repairs. : -7 Size M3 / M5 / M6 / M10 / M12 A total of 340 pieces, in a transparent box, suitable for different sizes of fasteners. - Made of 65 mn metal steel, burnt, ridgeless, has good corrosion and temperature resistance. - High quality starlock subordinate discs with inner dental, perfect for quick fixes and super simple repairs. - Accessories in machine equipment, industrial shock absorption and insulation production can meet your different daily requirements. Specifications: Material: 65mn metal steel Color: black Sizes: M3 / M4 / M6 / M8 / M10 / M12 Quantity: 340 pieces Package includes: - M3 - 60 pieces - M4 - 60 pieces </ p> - M5 - 60 pieces - M6 - 50 pieces - M8 - 50 pieces </ p> - M10 - 40 pieces - M12 - 20 pieces