Description: -This high quality star nut driver for inserting the star-fangled nut found on 22.2, 25.4, 28.6 mm threadless headset system -Upgraded design for easier operation and long handle prevents your hands from hurt -Just slide the outer sleeve over the steerer tube, drop the star nut in, it with the steerer tube with the alignment pin part and then give it a tap with a rubber hammer and you're done. -It is a great portable tool for bike repair tool, home bike mechanic and outdoor cycling - Precision control makes the star nut inserted stably without worrying overwhelming operation Specification: Material: Steel and Aluminium Alloy Outer Diameter: 35mm/1.4 inch Length: 108mm/ 4.25 inch Works for 22.2mm (7/8 inch), 25.4mm(1 inch ), 28.6mm (1-1/8 inch) threadless headset system Package Includes: 1 Piece Bike Star Nut Install Tool