The? Leofoto? MG-40X Lever-Release Rapid Lock Ball Head? was designed specifically to be used on an SA-X tripod, but it? features both the SA-X rosette connection as well as a standard 3/8" mounting socket. The head has a large knurled, knob control, to lock/unlock the ball? and a redesigned lever-release clamp system with an adjustable clamping width. Leofoto MG-40X 40mm Lever-Release Rapid Lock Ball Head w/Rosette, 3/8" Mounting Socket & Knob/Tension Control MG-40X-ARCA