Instantly locates exact rib centers for precision sight installation on most shotguns. Bar rides across barrels of shallow ribbed doubles, locating pins can be driven back for extra high ribs. Built-in, hardened marking punch moves freely, won’t fall out. Perfect on vent rib barrels. Mfg: Brownells SPECS: 2" (5.1cm) long, 5/16" (7.9mm) square bar.
