The Vortex Radian Ball Head offers smooth panning with 45 of tilt for maximum versaility and convenience. Twist locks with knurled control rings offer superior control and rigid stability, while aluminum construction supports even the heaviest of optics with ease, and without sacrificing smooth operation. Manufacturer model #: TRH-BAL1. Aluminum construction Durable twist locks with knurled control rings Smooth operation with easy adjustments Super strong to hold heavy optics