A forward offset mount to give proper eye relief specifically for AR platform rifles Heavy duty construction for extreme use 30mm or 1" ring diameter Dual steel locking lugs One-piece long clamp bar will not loosen or shift under heavy use or recoil 1/2" steel locking nuts 30mm Mount Places the scope 1.50 above the top of the rifle allowing for the use of scopes with up to a 56mm objective 1" Mount Places the scope 1.415 above the top of the rifle allowing for the use of scopes with up to a 56mm objective Constructed from 6061 aluminum, hard coat anodized for a lifetime of service 100% Made in U.S.A. with a lifetime w Mfg: Midwest Industries, Inc.