Tired of trying to secure your AR parts while installing a pin, detent, or spring? The AR-15 Bench Block is the answer! Specifically designed for AR-15 assembly and disassembly, the AR-15 Bench Block is the perfect tool. Made of extremely durable, non-marring urethane to protect the finish of your firearms and last for years. It features a variety of notches, grooves, and holes on both sides and is ideally suited for the upper receiver, lower receiver, front sight and charging handle of an AR-15.Specifications and Features: Positions the upper receiver, lower receiver, front sight, and charging handle for maintenance or assembly Durable non-marring urethane material to protect gun finish Designed to assist in all aspects of an AR-15 build Ideal for changing or adjusting triggers