THESE ARE ORINGAL HERMAN MILLER PARTS FROM REAL CHAIRS. THIS COMES COMPLETE AS YOU SEE IT! WHAT YOU SEE IS WHAT YOU GET! COMES WITH MECHANISM AND ALL POSSIBLE FEATURES CONNECTED. AS WELL AS BOTH SUPPORT ARMS AND LOWER CAP. AS IN THEY HAVE ALL THE PARTS BUT MAY NEED SOME TWEEKING TO MAKE SURE THEY ARE 100%. PLEASE BE AWARE BEFORE PURCHASING.