2.38 mm x 7.938 mm x 2.779 mm SKF D/W R1-5 R deep groove ball bearings

SKF Bearing 2.38 mm x 7.938 mm x 2.779 mm offers a 2.38 mm x 7.938 mm x 2.779 mm SKF D/W R1-5 R deep groove ball bearings selection GQ (Xiamen) Bearing Co., Ltd. of Genuine SKF Bearing at Wholesale Prices. We are 2.6875 in D a 2.38 mm x 7.938 mm x 2.779 mm SKF D/W R1-5 R deep groove ball bearings Certified Parts Retailer

What is D/W R1-5 R bearing cross reference？