The? Leofoto? MA-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 lever release to lock/unlock the ball and a? redesigned lever-release clamp system with an adjustable clamping width. Leofoto MA-40X 40mm Lever-Release Rapid Lock Ball Head w/Rosette & 3/8" Mounting Socket MA-40X-ARCA