85,725 mm x 168,275 mm x 41,275 mm ISO 677/672 tapered roller bearings

ISO Bearing offers a 85,725 mm x 168,275 mm x 41,275 mm ISO 677/672 tapered roller bearings selection of Genuine ISO Bearing 3212b-2ztn-nsk SKU: at Wholesale Prices. We Shandong Chik Bearing Co., Ltd. are 85,725 mm x 168,275 mm x 41,275 mm a 85,725 mm x 168,275 mm x 41,275 mm ISO 677/672 tapered roller bearings Certified Parts 60mm d Retailer

What is 677/672 bearing interchange？