Cold Drawn Square Steel Bar Steel Billet Steel Rod Standard: JIS G4105 Grade: 45#, A3, 20Cr, 40Cr, 20CrMo, 40CrMo, 20Mn2A, 42CrMo, 20MnSi, 35CrMo, HG3, Q215, Q235, B16, 25Cr2MoVa, 60Si2MnA, 55CrSiA, 16Mn, 40Mn, S45C, SAE1045, CK45, SCM440, SAE4140; 1.7225 Size: 16*16mm—-50*50mm Usage: Hardware tools, auto parts, standard parts, fasteners, general shaft, machinery manufacturing, light industry, hardware, standard parts, bicycles, automobiles, motorcycles, textile machinery, transformers and other machinery industries.