part name: 4 point contact ball slewing bearing (internal gear); Part number: 28-52/S-211; Dimension: 1767x1393x117.3mm; Material: 42CrMo; Unit weight: 622kg; Application: excavtor. For more infor, please contact us right away. You will get the quick and effective reply. Best Regards, Tong Luoyang Longda Bearing Co., ltd. No.82, West Zhongzhou Road, Luoyang, China 471003 Tel: 0086 379 64985493 Fax: 0086 379 64924823 Mobile: 0086 158 3793 0086 E-m: klim@ldb-bearing.com MSN: ldb-bearing@hotmail.com Skype: ldbearings www.ldb-bearing.com