30 mm x 72 mm x 27 mm ISB 2306 self aligning ball bearings

self aligning ball bearings offers SNR Bearing Argentina a 30 mm x 72 mm x 27 mm ISB 2306 self aligning ball bearings selection of Genuine self aligning ball bearings at Wholesale Prices. We are a 30 mm x 72 mm x 27 mm 30 mm x 72 mm x 27 mm ISB 2306 self aligning ball bearings Certified Parts Retailer

What is 2306 bearing cross reference？