... (1/4") to M72 (3") CLASS 4 5 6 8 10,GR.2 GR.5 GR.2H Surface: Plain, ZP,YZP,HDG ... " to 3"Grade: Metric size: 4 5 6 8 10 Inch.size: GR.2 GR.5 GR.2H Surface: SELF COLOUR, BLACK ... ,ZP,YZP,H.D.G, DACROMETMaterials:high quality carbon ... ,1587ISO STANDARD4032,4033,4034,4035,OTHERS:AS1112,BS1083,BS1768,IFI D-5,D-8,UNI5587,SQUARE NUTS,TEE NUTS nut din934