Bit arrived very quickly which they always do with this seller. I cut oak, oak plywood, alder with no problems. Slightly move part of the groove of the cut backwards, otherwise the drill bit will cut the edge of the tree. After cutting, the fit is excellent with about 1/16 left at the bottom of the groove. The material I cut out was 3/4 (the layer was slightly smaller). The bit stuck together a bit, but the CMT cleaner removed the material with no problem. AD2