Product features:OM-1R\OM-1L:1- For 1 "x1" rectangular optical components2- Angle ±3.5° adjustable3- Integral aluminum alloy, surface anodizedOM-1.5R\OM-1.5L:1- Suitable for 1.5 "x1.5" rectangular optical elements2- Angle ±3.5° adjustable3- Integral aluminum alloy, surface anodizedOM-2R\OM-2L:1- Install square or rectangular optics 2 inches high2- Mounting optical elements must be more than 3.0 mm(0.12 in) thick3-±3° pitch adjustment range, 5 mrad per revolution of the regulator4- Compatible with 0.5 inch and 1 inch joints