Tekz 45250 Metric Nut and Bolt Assortment - 475 Piece Contains: machine screws (20 ea) M4 x 16, M4 x 25, M5 x 20, M5 x 25, M6 x 20 Lock washers (50) m4, (50) m5, (25) m6 Flat washers (50) m4, (50) m5, (25) m6 hex nuts (50) m4, (50) m5, (25) m6