The Real Avid AR15 Master Bench Block allows you to free up your hands and have surgical precision. When working on an AR build it may be often you find yourself needing an extra set of hands while holding so many parts at once, now that will no longer be a thought. This Master Bench Block can hold your AR parts in eight different positions while you work, clean, or build your rifle. You won't have to worry about the block sliding around your workbench due to the over molding layer. In addition, there are four high-strength magnets inside that prevent parts from getting lost.