AjustLock Regular Stainless Steel Adjustable Barrel Bolt Catches are compatible with 2, 2.5, 3, 4, 5 and 6 inches barrel bolt locks. Per Jar contains 50 unit regular SS catches. The catches work with any misaligned barrel bolt and solve the common barrel bolt door shift issue. With AjustLock catch, you install it once and it adjusts on its own.