Everything you need to achieve a Professional shotgun sight repair or installation. Each kit includes the right drill bit and bottoming tap, plus sight(s) to help you clean up existing threads or install a sight with a larger, stronger shank. The Brownells 6-48 Kit features two, #4 brass front beads. Each Bradley kit has an Ivory, Bradley-type front sight. Mfg: Brownells SPECS: Bradley sights have 3⁄32" (2.38mm) long shanks. Sunspot sight has 5⁄32" (3.96mm) long shanks.