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. Two versions are available: one with a dual Arca and Picatinny clamp, and another with Arca only. Please select the option that best suits your needs. Height: 101mm / 3.98 inchesBall diameter: 40mm / 1.57 inchesWeight: 528g / 1.16 lbsMax load: 20kg / 44.09 lbs Mounting hole: UNC3/8", Rosette for Leofoto SA-X tripods