Installed on a new Gantry Crane. No instructions or paper work on how to install. Would be nice to know how tight the adjustment bolt should be. Works good.
I used 2 of these to attach chain falls to a 4 inch I beam. The beam was bolted through the top, and the smaller rollers allow it to travel without hitting the bolts or nuts.
Used this on an old piece of I Beam for a gantry in the garage. Rolls smoothly with lawn equipment. With a chain fall it helps get equipment up on saw horses for easy servicing. Saves an old mans back.
joshua martinez 
