... GB-M3 to M12, inch 5/32, 3/16, 1/4,5/16, 3/8Surface tratement: Yellow/white/black zinc platingQuality ... body, plaing, with flat head 2) High crimping force 3) Screw length can be varied 4) Just-in-time manufacturing ... SizeGB-M3 to M12; inch 5/32, 3/16, 1/4,5/16, 3/8MaterialCarbon steel, stainless steel and aluminiumHeadFlat head ... competitive price. stainless steel blind nut; rivet nut body closed end