This is a CCM clamping Feedneck for CCM threaded markers.  It features a helical cut for improved hopper grip and is compatible with CCM Lever Locks.

   CCM products are designed and manufactured in the United States and are machined from high quality materials such as 6061 air craft grade aluminum, 300 series stainless steel, and durable plastics such as delrin and lexan.
MADE IN THE USA