I am selling spring bars specially designed to fit Seiko dive watches and other dive watches. Seiko dive watches use unique thicker tipped spring bars to prevent watches from failing off your wrist during dives and other high force situations. Most third-party watch straps come with thin spring bars that don't fit perfectly into Seiko dive watch larger lug holes, increasing the chance of a spring bar wiggling out of the hole and you losing your watch. I lost my Seiko SKX007 a few years back during a ski trip because of a spring bar failure. The spring bar failed while I was skiing, and I didn't realize the watch fell off my wrist until I got to the bottom of the slope. Sadly, I was not able to find my watch and I am hoping to prevent other people from experiencing the same issue. Don't risk losing your watch because of the spring bar! These spring bars not only have thicker lug tips that fit snuggly into Seiko's larger lug holes, but the spring bars are also thicker as well. This helps prevent the spring bars from bending under load/pressure. I use these spring bars every day and have gone skiing/scuba diving without any issues! Each order is for two spring bars of either 20mm or 22mm lug width. To keep shipping costs minimal, I mail these spring bars out via USPS letter envelope. USPS does not offer tracking on these types of mail sadly. Please reach out to me if you have any questions!