Standard: DIN;ASTM,etc Grade: 4,5,6,8,10,etc Material: Carbon steel Finish: Black, ... M6 (1/4") to M72 (3") CLASS 4 5 6 8 10,GR.2 GR.5 GR.2H Surface: Plain, ZP,YZP,HDG,DACROMENT Diameters ... 4" to 3"Grade: Metric size: 4 5 6 8 10 Inch.size: GR.2 GR.5 GR.2H Surface: SELF COLOUR, BLACK,ZP,YZP ... STANDARD4032,4033,4034,4035,OTHERS:AS1112,BS1083,BS1768,IFI D-5,D-8,UNI5587,SQUARE NUTS,TEE NUTS din934hex standard ...