Place of Origin: Shandong, China (Mainland) Brand Name: HM Model Number: 20-150mm Material: steel Usage: Mine, Cement, Electric Power Plant, Chemical Plant Diameter: Dia.20mm-150mm Surface Hardness: 55-67HRC Core Hardness: 45-63HRC Certification: ISO9001, ISO14001,ISO18001 Packaging: Steel Drum or Steel Barrel, Container Delivery Time: Prompt Raw Material: High-Quality Round steel Impact Value: more than 15J/cm2 Breakage：≤0.5%