Features: 1) Diameter: 16 80mm 2) Materials: 60Si2Mn (9260 or SUP6), 50CrVA (6150 or SUP10), 60Si2CrA (9262 or SUP12), 55CrSi (SAE9254) 3) Mainly used in electronic vehicles, digging machines, industry ovens ,heavy machines and other huge assets 4) All of high qualityPacking: wooden boxes