Shakespeare - 4187HD Stainless Steel Heavy Duty Ratchet Mount - 4187HD EXTRA HEAVY-DUTY RATCHET MOUNT STAINLESS STEEL Versatile four-way ratchet design for deck or side mounting. Quick-action handle makes operation easy. Standard 1"-14 thread. The Style 4187-HD adds extra strength and rigidity. Use wherever its extra heavy-duty construction is needed. Standard 1"-14 thread. 9/32" hole for cable feed-through Bolt holes: 5/16" dia., 3" x 1-1/2" on center