Using a well-made spoon bit is an unusual experience. You can drill precisely, cleanly & quickly in any wood, at any angle of incidence, with not only total control of direction but the ability to change that direction whenever it pleases you. In fact, no other bits can match spoon bits for chairmaking no matter how expensive the tools or how complex the jigs to control them. A Highland Hardware User's Guide suggests ways to reshape and sharpen these bits for optimum performance. Set includes the sizes Mike Dunbar uses to make Windsor chairs: 3/8", 7/16", 9/16" & 5/8".