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 head, small/reduced head, csk headBody type: round, knurled/ribbed, hexagon, blindSize :GB-M3 to M12, inch 5/32, 3/16, 1/4,5/16, 3/ ...