This is the same grinder sold by a well known import tool dealer. Only they (currently) only sell theirs for $29.99. If you get this grinder from any source, be aware that the small end roller is made of rubber or some type of fiber that wears out quickly. Replace it with a metal pulley and this knot will actually work just fine. It actually works pretty well because a better one will cost you a little more than the combined cost of the block and spare reel. I give it 1* rating because this seller overestimated it. costs more since it is without modification.