Our brackets fit (2) 5 Gal./20 Liter fuel cans. They are designed to protect your fuel caps and are lockable. Also, our new handle makes it easy to take them off and on, and, if you have NATO cans, the handle can help you open the lock on the spouts. Compatible with tubing and mesh floors. If you own a Discovery 3 (LR3) or Discovery 4(LR4) and plan to place the fuel can holders in the front of the rack, please order the ones that are made specifically for your rack. FITS ALL EXP RACKS.