... /white/black zinc platingQuality Certificate: TS-16949 Characteristics and Functions :*Provide an efficient, cost-effective method of placing permanent, captive ... 1/4,5/16, 3/8MaterialCarbon steel, stainless steel and aluminiumHeadFlat head,small head,countersunk head, flat hexagon headBodyRound ... of the companies which with the longest history, scale and widest variety of riveted nuts in the industry, ...