IMPERIAL FEDERSCHEIBEN RECHTECKIG BSF BSW BSC 1/4 5/16 3/8 7/16 1/2 5/8" BZP

To fit all imperial fasteners - UNC, UNF, BSW, BSF, BSC etc. Rectangular section (made from rectangular wire). Imperial Spring Washers. Imperial spring washers. Coarse Pitch Bolts & Screws. Zinc Plated Spring Steel.

eBay