Great Planes Groove Tube-Grooving Tool FEATURES: Creates crisp, clean grooves in balsa by using a back and forth twisting motion; Creates a uniformly round groove that increases the rod's p INCLUDES: One Groove Tube Cutting Tool (in a storage tube, mounted on a photo illustrated header card with usage instructions INCLUDES: One Groove Tube Cutting Tool (in a storage tube, mounted on a photo illustrated header card with usage instructions