LaRue Tactical LT845 Quick Detach MIL-STD-1913 Rail Rifle Scope Optic Mount Features 3.875 inch of forward rail 1/4-20 threaded insert for Wilcox Raptar series rangefinders Height is 1.535 inch above the rail | Ring Size: 30 MM Included are one standard rear ring and one rear ring with a short rail section Made in America