The ends are straight 21.8mm, you can file them to 21mm 20mm 19mm 18mm 17mm 16mm 15mm 14mm or just under 13mm.
Can be used with solid-lugs or spring bars.
Spring bars are included, remember to tell us what size you need.
The length at the spring bars is adjustable at the center section from 5" (127mm) to 5 3/4" (146mm).
This is a great design:
The levers on each end open to install over spring bars or fixed lugs. To put the watch on wrist, the 6 end is detached from the watch, band is wrapped around wrist, end is installed on solid lug or spring bar, lever closed.
The center section is for length adjustment, it does not function as a clasp.
