Real Avid AR-15 Master Bench Block813119012495 HOLDS ALL KEY AR15 PARTS TO EASILY REMOVE 13 DIFFERENT PINS The most comprehensive AR15 bench block ever allows you to tap 13 critical pins from 5 different components. The block is wrapped in an over molding that grips to your bench to prevent slippage. Plus, engraved on the ultra tough engineering grade surface are clear component labels marked with pin punch sizes to make determining what component to place where and what pins to use,