Bahco 9526 combination auger bit set contains six of the most popular sizes these are dual purpose and can be used in both electric power drills and hand braces with a single cutting edge for easy regrinding though the need for regrinding is reduced as it is made from hardened tool steel for a longer cutting life the threaded tip moderates a self feed when using a power drill but still sufficient self feed when used in a hand brace for quick precision cutting with all types of wood supplied in a