Feature SCTM-67 30mm Flip to Side Quick Release Picatinny Mount Ring Quick Flip-to-Side Mounting Design Enables Instant 90 Degree Transition 40mm / 1.57" Central Height Provides Comfortable Sight Picture on AR Rifles Secure Picatinny Ring Ensures Rock-Solid Stability and Repeatable Zero Compatible With 30mm Optics Including Magnifiers and Red Dot Sights Specification SCTM-67 30mm Flip to Side Quick Release Picatinny Mount Ring Specification Details Ring Dia: 30 mm / 1.2 in Height: 66 mm / 2.60 in Central Height: 40 mm / 1.57 in (Bottom to Center) Length: 49 mm / 1.93 in Weight (Net): 91g / 3.21oz Material: 6061-T6 Aluminum Alloy Mount: Quick Release Picatinny Finish: Black Matte Items in the Package: T15 Torx Wrench Size