The series of CCD Adaptor Holders, GCM-080305M, is designed to mount the filters with minimum 2mm thickness to the CCD camera. There is 1”-32 male thread to match C-mount CCD camera, and 1.035”-40 female thread on the other end which is available for other types of CCD camera. The locking mode includes locking ring and locking screw, to mount various thickness filters.