Whether you're building an AR-style .308 rifle for the first time or performing cleaning and maintenance on your extensive collection, having a vise block for your workbench is a must-have. This simple tool provides a dedicated mounting point for your short-action rifle, allowing you to use both hands for parts installation and detailed cleaning. Each AR .308 Magazine Well Vise Block can be clamped into a user's workbench vise, allowing users to insert their lower receiver onto the exposed section of the block for a solid, secure working point. The block itself is made from injection-molded polymer and is made in the USA. The unit is designed for use with Armalite, DPMS, Remington, SR-25 and other popular lower receivers.