These expandable spring bar sets will fit a range of watches. If in doubt as to the exact measurement between the lugs of your watch then choose from the ranges offered here. There are four different size ranges avaliable in 1.8mm diameter: 10-14mm, 12-15mm, 14-19mm and 17-24mm. Spring bars with a diameter of 1.5mm are avaliable in 16-21mm lengths.