Detailed Product Description 1:Standard:DIN,ANSI,BS,GB,JIS,Non-standard2:Material:carbon steel ,35CrMo,40Cr and so on 3:Grade:From grade 4.8 to 12.9,grade 2H to grade 104:Dimension:M16 to M64,3/4"-2 1/2"5:coating:plain ,black, zinc,HDG6:Packing:small box with plastic bag,25KGS bag or box,bulk in pallet,according to customers' requirement