3/8″ x 3 1/8″ x 4″ Square U-Bolt Category: Heavy Duty Crank Up Related products Quick View Quick View Compact Mast Climber, Heavy Duty Crank Up, Single Mast Climber, Twin Mast Climber10 Inch Level Plank Adapter Read more Quick View Quick View Heavy Duty Crank UpTop Cable Head – Right Read more Quick View Quick View Heavy Duty Crank Up8′ Frame Section Read more