cargo crane and amusement equipment and aerial work platform round table bearing

Timber King Slewing Bearing offers 7.142 B1 a 12.5 SDM_ cargo crane and amusement equipment and aerial work platform round table bearing selection TFI Bearing Co.,Ltd of Genuine Timber King Slewing Bearing at Wholesale Prices. We are a cargo crane and amusement equipment and aerial work platform round table bearing Certified Parts Retailer

What is bearing cross reference？