... bolt nut at the reasonable price. 2.Produce with your drawings and samples 3.ISO9001.2000 certification ScrewsProduct name ... Wing bolt nut , Butterfly nuts ( Bolt nut )Material : carbon steel , stainless steel304 /316 , Alloy steel , Brass ..... As the customer requirementStandard : GB , ANSI . ... ! Hot-selling and best price butterfly bolt nut Stainless steel Wing bolt with butterfly nuts ( bolt nut )