(SS13X75Y12Z03D001) The 3 inch long lever Arm Lock device is used to lock the camera mount elevation angle in place. The Lever arms are clamped at a specific elevation angle with the lever arm lock piece and two 8-32 screws. The screws should only be tightened to be snug as to avoid stripping the threaded holes in the lever arms. Because of the lever arm lengths, the lever arm lock piece will make a secure clamping of the device at a specific angle. The lever arm lock piece comes in clear acrylic material.