This is a Filter Holder for the ZWO M54 Filter Drawer.
Made to fit 2-inch filters and offers you the flexibility to have more than one filter ready to go. Keep your drawer installed and just slide-in different filters as you need them.
Get more than one and you can reduce how often your filters are handled.
The double strong magnets on both the holder and your drawer create a stronger adsorption, for easier installation and removal of the holder with the drawer.
Internal M48 * 0.75 female(internal) thread (filter end). (Filter Drawer shown for use. It may be purchased, #ZWO-FH-M54.)