The WM1 uses a standard 1/4x20 thread to attach your favorite glassing head. When you have to cover country fast or the weather is too harsh, the Revic window mount will keep you stable from the vehicle. The ergonomic clamping knob and rubberized clamping face make attaching it a breeze. Clamp to edges up to 0.86" thick 2.44" Height 8.81 Max Load 0.55 Weight Aluminum Hard Anodization Mfg: Revic Optics