These weld on tie down loops are a great addition to finish your project off right, they make a perfect location to attach straps or bungee cords to secure cargo in your rig.  Safety should always be your number one concern when off-road, loose cargo can create a hazard to bystanders and also for occupants of the vehicle these tie down loops are a simple solution, simply weld them to your cage or chassis and you have a secure mounting point to strap down the cargo in your rig.  The dimensions of the part can be found in the picture above, they are sold in pairs.