Brownells Weaver 8-40 Sight Screw Counterbore

The Brownells Weaver 8-40 Sight Screw Counterbore is a precision gunsmithing tool designed to cut counterbored recesses for 8-40 sight screws. Used when installing or replacing front or rear sight bases, it ensures proper screw seating depth and a clean, professional fit. Ideal for gunsmiths and detail-oriented DIY builders working on sight installation and base fitting.