TIDE MOVEMENT This unique movement is geared to track tidal area's anywhere along the Atlantic Ocean and it's tributaries. It will also track parts of the Gulf. Excellent for Fishing, Crabbing, Boat launching and surfing. This special geared movement works off a 12:24 minute rotation. It tracks four tide changes in a 24:50 time period. Pacific Ocean Tide changes are unable to be tracked using a Tide movement. This is due to the irregular daily tidal changes, therefore a geared movement could not track them accurately. Tide Movement Size: Threaded Shaft Diameter:: 5/16" Dia x 1/4" High Tide Movement Size: 2 1/8"H x 2 1/8"W x 5/8"D Movements Include a 2 1/2" Black Spade Indicator Hand (Hour hand only) Threaded brass nut & Washer and cap nut. Rubber mounting washer. 10-year Warranty ( Longest warranty Available) Not recommended for outdoor use. We offer custom dials that can be made with your boat or water scene in the middle. It's a 10.00 artwork fee. Email me at Terry@MooreClocks.com with an attached jpeg 600pix by 600 pix or larger. These movements can be converted to any old plastic or wood clock you may have. Our dials can be made from 6" to 10" inches in diameter and made of quality photo card stock. It will show the high and low tide scale on the outside diameter. Please Note: The movements warranty will be voided if it has been used outside in the elements or mishandled.