Allows mounting on a flat surface or on the side of a gunnel or transomFor all Scotty post mount rod holdersTo use the new Scotty lock-down mount system simply choose the best direction to fish from and insert the rod holder or accessory, pushing the post straight down into the mountPlease Note:This mount is not compatible with our No. 132 Mounting Rivets, however it is compatible with No. 133 Well Nut Mounting Kits.Dimensions:4 x 2 x 2Bolting Dimension:1 5/16 x 3 3/16WARNING: Cancer and Reproductive Harm -www.P65Warnings.ca.gov