Includes: Leveling Kit Materials: 6061 Aircraft Grade Aluminum Compatibility: Picatinny/Weaver Rails Weight: 1 oz Finish: Hard Anodized Black Warranty: Lifetime Leveling device for ensuring precision vertical alignment of your rifle scope when mounting to your rifle. Kit comes with a leveling base and two leveling wedges. Smaller wedge for mounting scopes with 0.18 to 0.45 inches of spacing between scope and receiver/mount. Larger wedge for mounting scopes with .45 to 1 inch of spacing between scope and receiver/mount. The leveling base is positioned beneath the windage/elevation housing of your rifle scope and atop your receiver rail or the middle section of your one piece scope mount. Slide the leveling wedge into the slot on the side of the leveling base until the top of the wedge comes into contact with the bottom of your rifle scope housing. The top of the wedge provides a completely level surface on which to level your scope. All Monstrum products come with a lifetime guarantee.