This is a Photogenic 18" Reflector. It is a white finish "beauty dish" designed for use on Photogenic PhotoMaster Quick Change flash heads. Unit softens and broadens the light output which makes for flattering portraits.
The 3/8" Finger Nuts are used to securely lock the 9.Solutions 3/8" rods to different accessories. The 3/8" Connecting Nut is used to connect multiple 9.Solutions 3/8" rods together, allowing you to make longer rods.
Multiple rods can be used to create larger structures for rigging small cameras, lights, and a variety of other equipment.