This 4-prong front sight tool is designed to adjust the A2 front sight found on the AR-15, M16, and M4. It is machined from steel and has a black zinc finish to last for years. The key ring serves as a handle and helps keep the small tool accounted for. Install and adjust standard Mil-Spec A2 front sights on AR-15, M16, and M4 Can be used with any A 1/4" hex driver Key ring for storage serves as a handle also Black zinc plated steel