Depth stop collars and chucks designed for use with drills and counterbores.  Drills are held securely in place with set screws.  Industrial quality Chucks and Lock Collars ( or Depth Collars) from Southeast Tool.

Important Information Regarding Chucks:

Never Fail to remove the key from the chuck after using, always check before drill is turned on.  Before mounting chuck to spindle or arbor, thoroughly clean, then firmly press together.  Never apply extensions of any kind to chuck key handles.  Never subject chuck key handles to hammer or other impact blows.