344 Round Flush Deck MountSealed base for watertight applications (such as kayak decks) with splash cover.For all Scotty post mount rod holders.Dimensions: 3 3/4″ diameterBolting Dimensions 2 3/16″ x 2 3/16″WARNING: This product can expose you to chemicals including Diisononyl Phthalate (DINP) which is known to the State of California to cause cancer. For more information go to P65Warnings.ca.gov.