Securely mount your 100mm ball tripod head on the Hydra Alien system and gain height to create the shot you are looking for with this Hydra Alien 100mm Ball Head Riser from Tilta. Designed specifically to work with the Hydra Alien mounting system and made from stainless steel and aluminum, this rugged 6" riser provides a 100mm bowl for larger heads. The included tie-down nut allows you to secure the riser. The 100mm bowl is compatible with virtually all 100mm ball base tripod heads.