Instruct: Classify the given Amazon review as either positive or negative.
Query: A perfect Fit!

These are an exact match of all the parts needed to repair issues with my Craftsman 1/2 HP door opener.It comes with the shaft, main sprocket, gear on top, top plate, 2 other vinyl sprockets, a host of metals rings and some grease. Oh yes and some instructions :)Everything fit easily and quickly. Do listen to all the other reviewers and instructions when it says to first run the opener through a full opening cycle (without door attached) - - - before you go ahead and attach door trolley to chain! This ensures you attach trolley to chain at end of its opening cycle and not, somewhere in the middle where you door initially quit functioning...Bought the part for $25 and spent maybe 1 hour total removing and then installing new parts - q huge and worthwhile savings. I am not a mechanic nor particularly handy with tools - but Youtube has excellent videos explaining the process.