Ultimate Arms Gear Tactical Steel A1 A2 Front Sight Dual Headed Adjustment Tool 4 and 5 Prongs AR15 AR-15 M16 M-16 Adjust Elevation of either 4-Prong or 5-Prong A1/A2 Front Sight Post Optimal Length and Slimmer Ergonomic Design for Ease of Use Patterned Surface for Easy Grip One Piece Precision Machined Steel Part This is Front Sight Adjust tool for AR 4 / 15 rifles and like Style sights. This tool has dual ends to work with both 4 and 5 prong front sights ( A1 / A2 Style ) Very well made solid Steel