4k/4r-High Performance Maintenance Free Extended Swivel Lead Series-2,500lb

Swivel device is a combination of Ball Thrust Ball Bearings and Taper Roller Bearings for its maximum performance
Taper Roller Bearings in upper raceway to handle axial loads while operating at high speeds
Ball Thrust Ball Bearings as lower raceway to handle combined heavy radial and thrust loads
Extended swivel radius reduces the effort to start and swivel by half the force
3/8" thick top plate with legs formed from 5/16" steel
Designed for Ultimate solution of traditional casters with kingpin being loosened from lateral force
Yellow zinc plated to distinguish its superiority