The 9771 EC Platform Mirror Mount is ideal for applications where space is tight, and you want an optic mount that is also easy on your wallet. You get a 3/8 in. thick frame, our high-quality 6-80 knob adjustment screws, and 8-32 threaded holes that allow vertical mounting for holding 1/2 in. or 1 in. mirrors or horizontal mounting for holding cubes. For odd sizes, you can bond the optic to the front plate.