Securely mount your 75mm ball tripod head on the Hydra Alien system and gain height to create the shot you are looking for with this Hydra Alien 75mm Ball Head Riser from Tilta. Designed specifically to work with the Hydra Alien mounting system and made from steel and aluminum, this rugged 4" riser provides a 75mm bowl for larger heads. The included tie-down nut allows you to secure the riser. The 75mm bowl is compatible with virtually all 75mm ball base tripod heads.