4 Pin Automatic Watch Hand Installing and Fitting Tools Watch Needle Installation Tool for Watch Repairing. Interchangeable stakes made of synthetic material. Enhanced guidance of the spindles. High precision of positioning. Tip sizes (External Ø x Internal Ø): Ø2.60 x Ø1.60mm (Yellow) Ø2.10 x Ø1.20mm (Red) Ø1.70 x Ø0.60mm (Grey) Ø1.50mm (Blue).