1)GB-M3 to M12; BS-5/32, 3/16, 1/4... 2)carbon steel, stainless steel, ... , hexagon, blindSize :GB-M3 to M12, inch 5/32, 3/16, 1/4,5/16, 3/8Surface tratement: Yellow/white/black zinc ... and so on SizeGB-M3 to M12; inch 5/32, 3/16, 1/4,5/16, 3/8MaterialCarbon steel, stainless steel and ... service for you with the good quality and competitive price. rivet nut stainless steel; carbon nut