RAM Mounts Tough-Tube Fishing Rod Holder System The RAM Industries Rap-394-Ssbmpu is a versatile rod holder system that includes the Tough-tube fishing rod holder, a 3 long splined post arm, and a dual-function mounting base suitable for both bulkheads and flat surfaces. The splined post arm features a ratcheting mechanism that offers 180 degrees of adjustability for optimal angling. The mount accommodates the rod holder in two distinct orientations, perpendicular to each other, catering to various installation preferences on either flat or vertical surfaces. Additionally, it incorporates a secure locking mechanism that necessitates the use of a plunger for rod holder detachment. This rod holder system is designed for a broad array of vehicles, ranging from kayaks and tournament boats to ATVs and UTVs, making it an ideal accessory for enthusiasts seeking to enhance their fishing experience. Dimensions: Inner tube diameter:1.9 Inner tube length: 10 Mounting Specifications: Flat base hole pattern: 1.3 x 3.16 Materials: High strength composite