Metal Screw 1.HS code:7318159090 2.Standard DIN7504K/P/N 3. ... : spring nuts, T nuts, K nuts, rivet nuts, cage nuts, lock nuts, hex nuts, hex flange nuts, wing nuts, weld nuts ... , square nuts, cap nuts.Washers: flat washers, spring washers, lock washers, structural Washers. square washer, bowl washer.Screws: machine screws ... TransportationThe Best Choice for You Type A/B sheet metal screw