You are about to buy, a 100 lot pack of F to BNC Connector, BNC Male Plug to F Female Jack Coax Adapter 75 Ohm

This is an Amazon return, and the bag has a small hole, so several of them would be missing (no 100 no more but maybe 90 or so).

From manufacturer:

Work with RG6, RG59 coaxial cable on scanner, security camera, tester, DVR, etc.

Made of brass copper, nickel plated with gold plated contacts for increased corrosion protection. Cleanly threaded and latched on securely without wiggle.