Northern Chain Saw Sharpener – Heavy duty. Only used a couple of times. Almost just like a lot more expensive Oregon Sharpener.I’ve fully disassembled, deburred, smoothed, and lubricated all surface so it now functions well. Seems like new – with the exception of some grinding residue on back of the housing. Includes three grinding wheels( 3.2, 4.7, and 6.0 width) and tools, in addition to instructions. Not physically ready to make use of chain saw!