Zinc-plated for corrosion resistance. Hexagonal drive flange nuts with serrated bearing surface. Protruding flange allows use on irregular or oversized holes. Includes assorted sizes M5 to M12. Handy storage case with compartments. Zinc-plated for corrosion resistance. Hexagonal drive flange nuts with serrated bearing surface. Protruding flange allows use on irregular or oversized holes. Includes assorted sizes M5 to M12. Handy storage case with compartments.