BSB's new bearing birdcage is the lightest steel bearing cage on the market. This birdcage has a newly designed hubs which allows for less bolts and more clearance. You have the ability to lock this cage up and use it as a two link or you can use it for a swing arm or just a good old 4 bar birdcage. All of the same great features as the BSB7320, but stronger at the bottom. Single row of upper holes. 3/4" holes in lower for 2 links. Works on both right and left side. Comes with 3. 008" size bearing.Pit Stop USA offers BSB Roller Bearing Birdcage 7100 at low everyday prices. Be sure to check out all of our products from BSB Manufacturing including BSB Manufacturing Steel Roller Bearing Birdcages.