Grinding steel rod, our company manufacture and export is as follows: 1. Specifications: 1) Size: Dia. 40 - 120mm, Length 3000-6000mm 2) Hardness: HRC 45-55 3) Chemical elements(%): C: 0.48-0.85, Si: 0.15-0.37, Mn: 0.7-1.0, P: 0.035 MAX, S: 0.035 MAX 2. Technical parameters 1)High Hardness 2)high impact value 3)low breakage 4)no deformation 3.Raw Material As we all know, the quality of product mainly depends on raw material, so our raw material is customized from the Chinese famous steel factory, which can guarantee the quality. 4.Testing Our lab is equipped with advanced testing machine to strictly control the quality of the product. 5.Package We bundle the finished products according to the customers' requirements. http://www.huaminsteelball.com/grinding_rods/grinding_steel_rod.html