Drill Collets effectively convert a Straight Shank tool of any kind (typically drills and reamers) into a Threaded Shank tool. Most commonly used to adapt drills, they can be used with broken drills, reamers, or other straight shank cutting tools such as counterbores and countersinks. Simply choose a collet with the appropriate size to fit the straight shank tool to be adapted. Great for emergencies, and getting into tight places.