The easiest way to increase the stability, grip, and durability of your plastic leveling bucket or stacker setup. With The Base you quickly and easily increase the footprint and durability of your bucket jack blocks or plastic stacker setup. Made from the same rugged recycled rubber that SnapPad is famous for, the Base is a universal stability-enhancing solution that fits Andersen Trailer Jack Block, as well as a wide variety of standard 8-1/2" x 8-1/2" stacker blocks. Includes one 14" base. For 12" leveling buckets or 8-1/2" plastic stacker blocks1-1/8" thick - adds 3/4" to your stacker setup