4187 Stainless Steel Ratchet Mount 
Versatile four-way ratchet design for deck or side mounting. Quick-action handle makes operation easy. Standard 1"-14 thread.
Features:
9/32" hole for cable feed-through
Bolt holes: 5/16" dia., 3" x 1-1/2" on center
This item is boxed not in retail clamshell