Larger than the original Catch Patch (designed for a hat), our new Fat Patch is built for those anglers who wear a vest, chest pack or gear bag. It has the capacity to hold even the largest flies. The spring loaded clutches will hold the Fat Patch securely. To remove the post, pull out on the end of the clutch and pull. To replace, simply push the clutch back on the post. 2 7/8" x 2 7/8"