The Revic MS1 Binocular Mounting Stud is compatible with the Revic BM1 Binocular Mount to secure the Revic Acura BLR10b. The mounting stud is attached to the binocular by unthreading the Revic logo cap from the objective end of the bridge and threading the MS1 on. The mounting stud is secured using a 5/32" or 4mm allen wrench. 1/4-20 Threaded Stud Weight: 0.2oz (5g) Machined Aluminum Hard Anodization Mfg: Revic Optics