Fastener type: Insert Made from high quality material which provides strength, protection and long service life. Comes with a plastic storage box for convenient use and storage. It can be installed in seconds form one side of the work. Product use: used in the fastening field of metal plates, pipes and other manufacturing industries. The assembly of light industrial products solves sheet metal. The thin tube welding nut is easy to melt, the base material is easy to weld and deform, and the tapping internal thread is easy to develop Slippery, no need to tap the internal thread, no need to weld the required nuts, high riveting efficiency, easy to use. colour:Silver Material:aluminum Package Contents: 50 x M3 Nuts 40 x Nuts 40 x M5 Nuts 30 x M6 Nuts 20 x M8 Nuts 15 x M10 Nuts Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.