1)GB-M3 to M12; BS-5/32, 3/16, 1/4... 2)carbon steel, stainless steel,aluminium 3)RoHS Compliant; TS-16949(including ISO ... 9001 carbon nut furniture nut insert nuts:Material: carbon steel(C1006A,1008A,1010A),stainless steel (304,316) aluminium(5052,5056)Head type Flat ... so on SizeGB-M3 to M12; inch 5/32, 3/16, 1/4,5/16, 3/8MaterialCarbon steel, stainless steel and aluminiumHeadFlat head,small ...