This is an empty Kernel filter holder with no filter glass installed. There is a large white square that can be used to label the filter at your choosing. See supported filter glass size below. Included is the filter holder, the filter holder retaining ring and the filter installation key. To tighten the retaining ring we suggest the sharp ends of a caliper, or other similar tool.
Outer Diameter Threads: 25.4mm x 1-32 UN 2A (C Mount) pitch
Clear Aperture: 9.0mm
Filter Mount Thickness: 3.0mm
Mount Material: Black Anodized Aluminum
Filter Glass Thickness Supported: <1.5mm
Filter Glass Diameter Required: 10.5 +0/-0.5mm