Heavy Duty 3 coil springs
51 Ball Bearing style. (More ball bearings are smoother rolling, provide greater distribution of weight and will be longer lasting)
Top plate holing 5 3/4" on center of 7/8" slot
3" high 1/4" Tilt
Quality exceeds most original installed units
Manufactured for Abacus swivel chair parts to provide the very best rocker swivel box you can buy! It doesn't get any better than this or we would offer it.
51 large Steel (not plastic) ball bearings
Pre lubed raceway