The Wheeler Engineering Delta Series extended Armorers Bench Block. Tired of trying to secure you extended 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. 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. 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 Holds lower secure for roll pin assembly. Perfect for gas block pins WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov