As my tests showed, this drill bit was a complete waste of money. The bit is advertised as being able to handle industrial and scientific use, but my experience was far from that. The bit failed to cut smoothly instead leaving rough edges that required lots of sanding. It also overheated quickly and became dull, making it nearly useless for large projects..
Pros
None
Cons
Misleading advertising, ineffective cutting ability, overheating and dullness
Drilling a 2-1/8" hole in the SOFT wood of the cabinet doors with my cordless drill worked great. As previously mentioned, with hard wood, a drill press is probably the best way to use this forstner bit.