Headache-saving tool includes an adjustable, spring steel collet that positively and delicately holds the globe of the sight for easy, damage-free installation. The spring steel is gentle on the sight beads, plus stands up to repeated use for a long service life. A Brownells screwdriver handle improves your control to tightly screw in the sights without damage to them or the barrel. Available in Small and Large to accommodate practically any sized sight bead.