Reddit mentions of SUNLITE 1-Piece Chainring, 3/32, 44t

One piece cranks are pretty easy to work on so they are a good intro to working on bikes. The only tool you need is a big adjustable wrench and some grease to get them up and running.

Six speed is the correct terminology. Bike speeds are typically expressed in one of two ways, the amount of rear cogs multipled by the number of front chain rings (7 in the rear 3) or by the amount of rear cogs.

If you decide to replace the chain, freewheel (rear cog set) and chain ring you will need the following, chain, freewheel, and example chain ring The chain ring you get needs to say that it works with chains that are 1/2 x 3/32. If you want to be anal about this, you can count how many teeth are on the small cog and big cog of your old freewheel and get a new one that matchs that range along with getting a chain wheel that has the same amount of teeth as your old one. This is likely to preserve your old gearing. This is not a huge deal for casual use, though it's something to keep in mind.

You will need a freewheel remover tool to get your old freewheel off. There are about ten different ones, so I would suggest going to bike shop and having them remove it, or have them tell you which tool you need. You don't need a tool to install a new freewheel.

Also, to install the new chain you will need a chain breaker.

However, I still doubt you need to replace all that crap. I'd start by fixing the bottom bracket, then seeing if that solves the crunching and chain jumping problem.