hex cap nut: 1)Material:steel,stainless steel, 2)Surface:zinc(white,blue,yellow,black) 3)sizes: supplying all kinds of sizes hex cap nut:Item name: high quality hex cap nuttdesign prevents burnouts and eliminates the need for indexing and retapping to remove weld spatter.Thread sizes #4 to 1/4"size: M6-M24Material: stainless steel,iron,copper,carbon steelFinish: black nickel,white zinc,bule zinc, ...