The PerFit® Perforated Tropic Diver Rubber Watch Band is a perfect fit for CITIZEN Promaster, Aqualand, SEIKO SKX, Turtle, Tuna and others. Covering all the most popular diver watchband sizes, including 22mm, the PerFit® Tropic Diver delivers performance and value. To determine the proper width, measure watch lug width where the current band attaches. No ruler nearby? A dime is nearly 18mm, a nickel is slightly wider than 21mm and a quarter is slightly wider than 24mm(you have to figure out the rest). Wear it in good health! The PerFit® Promise: you’ll be happy with the Perfect Fit or your money back. PerFit® Perfect Fit, Guaranteed.