The RAP-B-365-1-339U is made up of a 1" ball connected to a triple magnetic adapter system, with each adapter connected by its own 1" ball and socket joint. Each magnetic base contains three rare-earth magnets (nine total) which lock up securely against any steel or ferromagnetic surface. The soft composite coating on the magnetic adapters prevent scratching or scuffing of the surface you are attaching to.

Material: 
High Strength Composite and Powder Coated Marine Grade Aluminum 

Ball Size:
1" Rubber Ball Size 

Note: 
The "U" in the part number reflects product packaged in poly bag.