A forward offset mount to give proper eye relief specifically for AR platform rifles Heavy duty for extreme use 30mm 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 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 warranty Torque cross bolts to 45 INCH/pounds Torque ring cap screws to 25 INCH/poundsQD30SM Technical Specs (30MM)Works with scopes with up to a 56mm objectiveWeight: 8.4ozOverall length: 5.875 in.Width of rings: .85 in.Distance between rings: 2.80 in.Offset from the first ring: 1.40 in.Distance - top of rail to center line of ring: 1.50 in