The FH1L was designed as a primary glassing head, with ultra smooth tilt-and pan functions. The new Lever Clamp locking mechanism makes clamping in your rifle, spotter, or binoculars swift and foolproof. The clamp features a more visible bubble level and toolless adjustment. Arca-Swiss Standard Lever Clamp Locking Mechanism 3.7" Height 1.96" Base Diameter 165Adeg Tilt Range 360Adeg Panning Base Travel 8.81 lbs Max Load 1.33 lbs Weight Mfg: Revic Optics