Size:M3 Description: A nut is a type of fastener with a threaded hole. Nuts are almost always used. in conjunction with a coupling bolt to connect two or more parts together. The two partners are held together by a combination of their friction through the threads, a slight stretching of the screw, and a compression of the parts being fastened. hold together. Specifications: Material: Carbon steel coated; Zinc Grade: 8.8 Standard: DIN934 Black Color Size and Quantity (Optional): M2 x 100pcs M2.5 x 100pcs M3 x 100pcs M4 x 100pcs M5 x 100pcs Package Included: 1 Set x Nuts