The BM1 has a tried-and-true post design, while incorporating important design elements. The machined base integrates Arca-Swiss mounting, you can leave the base plate at home. Separating the locking knob from the push button is more user-friendly and more secure. The included mounting stud features standard 1/4x20 threads, and is compatible with the Revic BLR10b binocular! MS1 Mounting Stud Included Integrated Arca-Swiss Standard 3.95" Height 8.81 lbs Max Load 3 oz. Weight Machined Aluminum Hard Anodization Mfg: Revic Optics