After consulting with professional armorers across the industry, Obsidian Arms now has the ultimate punch set for work with the AR-15 platform, providing builders and gunsmiths with a 12-piece set that can do it all. All of the punches needed to build or disassemble an AR-15 are included in this Complete Armorer's 12-Piece Punch Set, including starter punches, roll-pin punches, flat-sided punches for the bolt-catch pin, Delrin punch, drift pin and even a special tool for installing pivot-pin detents! Each of the Obsidian Arms punches included in this 12-piece set are made entirely from 4140 alloy steel, heat-treated and QPQ-finished for durability and corrosion-resistance. The set also comes with a lifetime warranty. If you break a punch, the company will replace it at no charge to you.