Tapered, ivory-color mid-rib bead helps prevent canting the gun or aiming over the top of the front bead. Stake-on design installs easily at center of barrel or 12' to 16' from muzzle. Drill a #45 hole, follow with #226 Bead Sight Reamer, and press-fit in place. SPECS: Ivory-colored, .080' (2mm) diameter.