I have used this cutter half a dozen times and am very satisfied. Counting the turns to get an accurate cut can be a problem when I digress, but it gets you pretty close to a test cut. It beats seals and bearings. It's a little expensive but worth the money. The markers may be more prominent in red or white to make counting turns easier. Leaves a nice cut. I can get a companion bit, 1/8th to 1/4th, but I'll wait to see how often I actually use a sub-quarter inch slot.