Fulton Swivel Trailer Jack BoltThru 1500lb #220XP10010110" Travel, 25" Lift, 6" Wheel SizeThe Fulton brand boltthru swivel mounts use 3D formed heavygauge steel stampings and a proprietary bushing material for a mount with minimal deflection and maximum support. All mounts fit up to a 3" x 5" trailer frame.Strong proprietary bushing materials Stable formed heavygauge steel construction