65pcs iron inside hex drive head screw insert nut threaded for home use

made from iron material, high hardness and a long service life. there are total 65pcs hex nuts, 20pcs m6 x 10, 20pcs m6 x 17, 10pcs m8 x 13, 10pcs m8 x 20, 5pcs m10 x 20, in one set that you can use for many projects. they are simple to use and convenient to connect wood assembly link to other parts. mainly used for furniture, embedded screws. have the function of fastens furniture and wood board..syi