Product Name:sleeve nutsMaterial:Carbon steel(C1006A), stainless steel (304, 303,302),aluminium(5052, 5056,6062,6066) ,Brass,Copper,etcHead 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, 3/8Surface tratement:Yellow/white/black zinc plating /Zinc/Nickel/Phosphate/Oxidation black/Passivation/Tin/Chrome/etcStandard:Non-Standard ,PEM Standard or base on the Drawings or SamplesTolerance:+/-0.03MM; +/-0.002 inch*Can be widely used in the industries such as railway, elevator, refrigeration facility, medical equipment and so on.FLAT HEAD, HALF-HEX BODY, OPEN END rivet nut/riveted nut with best quality and low price