Features:

• High quality CNC machined and precison ground brass contruction
• The adapter comes with 5mm screws for tightening it to the lens
  without any pressure on the lens focus inner cylinder
• May also be attached to old bayonet lens by the 6 holes drilled
  around it (with flat head screws NOT included)
  
• PL means "positive lock," the successor mount to the Arri Bayonet
• The PL adapters were made especially for Illumina lenses but can
  work for other old bayonet mount lenses. The idea is to find excellent
  old lenses, which are on the market for a good price, and adapt them
  for modern use.