Lot of three Thorlabs CCM1-4ER/M cage cubes with lock rings, plus one CP36 coupler plate. All 3 are populated with BS022 beamsplitter cubes (as etched on the internal prisms); the third cube is present with a plug/cap. All three feature SM1-threaded ports and 30 mm cage compatibility for quick integration into existing ER-rod assemblies. Keyword Block: thorlabs, ccm1-4er/m, bs022, beamsplitter, cage cube, 30 mm cage, sm1 thread, cp36, optics mount, lab optics, optical cube, lock ring.