NX Filter Frames are required when using the NX Series Holder. The lightweight, aluminum frames are essential to the Holder’s slim design and allow maximum ultra-wide-angle lens compatibility. The frame also protects the edges of the filter and allows you to handle filters without touching the glass.
The 100mm x 143.5mm frame will hold most square filters, including other manufacturers, that measure 100mm x 143.5mm x 2mm thick.

Compatible Cokin filters:
Filters and frames are sold separately to accommodate different Cokin holder systems.
Assembly Instructions
Each frame includes a small screwdriver to install a corresponding filter:
1. Unscrew the metallic cover with the screwdriver keychain
2. Insert the filter into the frame
3. Re-tighten the metallic cover

Included are two spare screws, just in case, and ten stickers to note the exact type of filter on its corresponding frame.