Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: What is the diameter of the bar?
Document: I am at a loss now since there is no way to get the parts needed to use the chin up bar safely.
This is a heavy bar...please make sure you know what you're doing when installing it. There are 4 mounting points and I cut out 6&#34; x 3&#34; squares from drywall and in its place I glued and screwed 1/2&#34; plywood to studs. This ensures a nice solid all wood connection.
Don't always trust stud finders! I had to go behind a wall and install a sister stud for one of the mounting holes. Take your time and do it right. Love the bar. It's exposed grip length is 46&#34; which is plenty for my long wing span. I'm 6'3&#34;. The bar is approx one inch thick and is smooth...not knurled.
Pros:*  Well made, very sturdy and durable. The uprights are heavily chrome plated and the bar itself is solid steel; the total assembly weighs over 30 lbs*  One of the few wall-mounted chin-up bars that is the right width for screwing into regular US wall studs. The mounting holes are exactly 48" apart (not 45 5/8" as the instructions claim); the mounting holes will accept up to a 7/16" fastener.
This IS a 2 man job when it comes to sliding the bar apparatus on the vertical supports. Unfortunately I had to do it myself. Very difficult, took an hour and I was completely exhausted. I had to turn into macguyver and rig up chain supports to hoist it up (keep in mind I installed this very high on a wobbly wooden step ladder). Anyhow, this looks and feels really solid and I'm very happy with it. It was pricey but safety is important. It's rated at 350lbs.
Received the chin up bar the other day, opened the package and found i was missing 2 of the needed pieces that are referenced in the instruction manual. Looked through the packaging 3 times to make sure I did not miss them. I tried contacting the company that makes the bar to get replacement parts but they told me they do not provide any product support, replacement, and did not even know my order since it was placed on Amazon. What type of company does not warranty their products?
It's big! Make sure you have enough room. I installed it in my stairwell. Yeah I know, crazy but it works. It feels pretty darn solid and I'm 220lbs. I have years of construction experience so I installed this myself. I would not trust anyone else to put a bar 9' up. Using the info from another reviewer and after I did my research I opted to forego lag bolts for heavy duty rigid construction screws (RSS) made by GRK.
Kind of pricey but this is no door hanging unit. If you want one that is strong and durable and that going to last,this will work.We mounted this to a block wall and it does not move ,flex,give at all!And its adjustable for those vertically challenged.All though the first unit arrived missing parts and one of the tube slides was bent (poor packaging), but after notifying Amazon they sent another one right out.
(I opted for large RSS screws instead of unrated lag bolts from the local home improvement store)*  "Requires professional installation" - in reality you only need very basic skills on how to find a stud, drill a hole and use a level
Answer: yes