The Big Jon Universal Gimbal Mount is constructed from durable 6061 T6 aluminum and is corrosion resistant to harsh saltwater conditions. The Universal Plate mount fits securely into the flush mount rod holders and the various angles will work with any downrigger on the market. Machined 6061 T6 aluminumAnodized finishCorrosion resistant15 degree: No offset 30 degree: 45 degree offset M90 degree: No offset Fits into the flush mount rod holders Mounting plate dimensions: 5 x 6 x .5 in. Gimbal tube dimensions: 11.5 x 1.5 in. with 1/8 in. wall thickness Manufacturer's limited lifetime warrantyThe Big Jon Universal Gimbal Mount is made in the U.S.A.