Foxnovo Universal Expanding Hole Opener Reamer Drill Tool 0-14mm for RC Car Helicopter (Blue) Color: mainly blue. Material: durable hard steel and aluminum alloy. Size (Hole diameter): about 0-14mm. Universal Expanding Hole Opener Reamer Drill Tool 0-14mm. Can be used for RC car and helicopter. Utilizes high strength alloy steel material to reduce wear and distortion. Bore diameter indicator for easy operation. .