The Arisaka Ring Light Mount provides a flexible yet secure way to attach handheld Lights to your handguard. The vertically anchored ring system will accept light bodies with a diameter from 1.00" to 1.03." A light can be installed and removed without having to take the mount off your handguard.NoteThe offset placement of the light while using the mount is designed to allow clearance with most front sights. For example, a 1.03" light like the Surefire G2 will work with the Magpul Gen 2 MBUS on a Noveske NSR, which is one of the thinnest handguards at 1.48" wide. Requires a 5/32" Allen wrench and T15 Torx driver for installation (not included).