3/8″ x 3 1/8″ x 4″ Square U-Bolt Category: Heavy Duty Crank Up Related products Quick View Quick View Heavy Duty Crank UpWinch – Right Read more Quick View Quick View Compact Mast Climber, Heavy Duty Crank Up, Single Mast Climber, Twin Mast Climber12′ Platform Extension Read more Quick View Quick View Compact Mast Climber, Heavy Duty Crank Up, Single Mast Climber, Twin Mast Climber50″ Level Plank Adapter Read more