Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Are all the chisels the same size width?thanks
Document: Great purchase. Have purchase Neiko electric jackhammer before, now it can be ordered with more chisels. Being able to perform some of the smaller pavement jobs without pulling an air compressor trailer allows crews beter response times.
This jack hammer is the best price for performance/quality available. I am digging an oval 18x30, 5 foot deep hole for a pool. Here in Phoenix the dirt is mostly caliche, which is hard a rock. This is a monster of a job, and thankfully this hammer (using the chisel and the spade) is up to the task. With weeks of use, no problems at all, just requires checking & retightening of the bolts. I would highly recommend this product to anyone.
My jack hammer has about 10 hours on it now and it works well, remember to check the oil and keep the bolts tight.
Made quick work of breaking up about 40' of in-ground pool wall footing that I had to remove. Well worth the cost.
It's great for home use. I've used it quite a lot already. Much sturdier than I expected. My husband loves it.
I purchased this item as I have over 5 acres to work on. Most of the soil is mostly rock with some clay. The chisel bit has been extremely helpful in working through the rock. It has held up well in long period of work and heat. The spade bit has worked well for small stumps and digging post holes. It has been a real time saver, since the alternative is a pick. I would buy it again and would recommend it. .
I just added it to the arsenal. If you don't have it at the correct angle it won't start the hammering effect and restabbibing the working end get's a bit heavy after a while. Once it get's going it is a small, noisy jack hammer for sure. While I was using it I called my wife out and asked her if she wanted to see my jackhammer, I was very proud.......
I hit rock when I was digging a trench in my yard for a water line and I didn't want rent a breaker because I never know when I will have time to work due to the weather. I went out on a limb and bought this unit because the industrial versions are really expensive. I must say I was impressed, now its not as fast as a one hundred pound hammer, but it works if you take your time and dont crowd it.
I haven't used this tool yet. However, after unboxing this tool from its shipment packaging, It is a very sturdy tool. It is a little heavy, however it appears to me to be more than adequate and excellent to use to break up surfaces. Would recommend to others. Great quality.
Great tool for the price! Heavy, and worth the money. Worked great to get through our hard ground. Did a great job.
Answer: no