I see no problem with this chuck. Since several reviews indicated a malfunction because of debris inside the chuck, I immediately disassembled it upon receipt. Disassembly was simple. One review stated the jaws didn't close evenly. I think those jaws were removed and were not reassembled in the correct order.I found one small chip inside which would have never caused a problem. The chuck was well oiled, wrapped in plastic, and packaged securely.I am in the process of turning the backing plate, so I can not yet attest as to the trueness of the jaws, but, I don't foresee a problem. The OD of the chuck is larger than 6". It measured 6.424". There is one plastic piece attached. It seems to be a "dust cover" on the back side and has no mechanical function. The jaws are numbered, (1,2,3) but, the chuck itself is not numbered. I plan to just number stamp it myself.I can see this chuck giving years of service. I feel I got a good deal.
A M W 
