The Universal Camera Ball Leveling Head will support up to 75lbs. It features a 55mm dia. solid ball and tightening control knob that allows for quick and secure locking of the camera''s position. The base is made of a 3/8in thick aluminum cheese plate measuring 8in (203mm) x 8in (203mm), and comes with the industry standard 3/8in mounting holes, spaced every 1in. The top mounting plate comes with a 3/8in (10mm) slot that is 100mm in length, allowing it to use a standard ARRI Sliding Base.