An irrigation sprinkler is described. The irrigation sprinkler includes a first ring including a first edge defining a first plurality of semicircular recesses and a second ring including a second edge defining a second plurality of semicircular recesses. The first ring and the second ring are secured together to define a plurality of circular recesses. The first ring includes a fin proximate each circular recess. The irrigation sprinkler also includes an adjustment mechanism disposed within each of the circular recesses. Each adjustment mechanism includes an outer rotating member including an annular structure comprising at least one of an annular recess and an annular protrusion, and an internal chamber including inwardly disposed threads. Each adjustment mechanism also includes an inner cylindrical member including an outer surface. The outer surface defines outwardly disposed threads and a channel. The channel extends radially along only a portion of the inner cylindrical member.