54 Watch Band Cotter Pins For Watch Repair. This is a new set of 54 watch band cotter pins. Great for watch repair. Each measures 1 mm thick. You receive: Three 6 mm (0.23622") cotter pins. Three 7 mm (0.27559") cotter pins. Three 8 mm (0.31496") cotter pins. Three 9 mm (0.35433") cotter pins. Three 10 mm (0.3937") cotter pins. Three 11 mm (0.43307") cotter pins. Three 12 mm (0.47244") cotter pins. Three 13 mm (0.51181") cotter pins. Three 14 mm (0.55118") cotter pins. Three 15 mm (0.59055") cotter pins. Three 16 mm (0.62992") cotter pins. Three 17 mm (0.66929") cotter pins. Three 18 mm (0.70866") cotter pins. Three 19 mm (0.74803") cotter pins. Three 20 mm (0.78740") cotter pins. Three 21 mm (0.82677") cotter pins. Three 22 mm (0.86614") cotter pins. Three 23 mm (0.90551") cotter pins.