This 6″ riser is adapted with a threaded attachment for use with Olson mim-sprinklers. (Use 12 or 18″ riser tubes with O-Jets, Ultra-Jets and Micro-Sprayers.)Base end screws into Olson Clamp with fitting to attach 1/2″ poly tubing. Stabilizer Base allows sprinkler set up to be attached with ground staples to garden bed.(Stabiilzer base and clamp add an additional 1-3/4″ in height approximately).