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.