Uncle's notes: There are several stock Seiko bracelets that come with limited micro-adjustments. I heard this complaint many times and decided to do something about it! These clasp covers come in 2 sizes and allow 3 micro-adjustments. They are compatible with many different stock Seiko bracelets, as well as some of my bracelets. To know which size you need, just check the taper of the bracelet. If it measures 18mm where it connects to the clasp, you need the 18mmm clasp (for example). Please note: A few of the stock bracelets have a semi-permanent fixture on one side that is a rod and not a spring bar. That might be hard to remove and this might not be the fix you are looking for. Specs: Length: 22.7mm Weight: 6 grams Material: 316L Stainless steel Finish: Brushed metal Adjustment: 3 micro-adjustment holes to insure proper fitment