Wheeler Scope Ring Alignment and Lapping Kit 30mm and 1 in. The alignment bars in this kit provide for perfect alignment of both rings and will also diagnose any misalignment problem vertical or horizontal giving you the opportunity to fix the problem before damaging the scope or experiencing frustration at the range. The lapping bar is used to lap the rings to improve alignment reduce stress on the scope and improve the grip of the rings on the scope. It also serves as a lever to rotate dovetail rings into place. Lapping the rings can also minimize or prevent ring marring of the scope. Specifications for Wheeler Scope Ring Alignment and Lapping Kit 1in/30mm: Manufacturer: Wheeler Engineering Included Accessories: Lapping Bars Lapping Bar Handle 220 Grit Lapping Bar Compound Alignment Bar Additional Features: Combo Condition: New Quantity: 1 Kit Tube Diameter: 1 in 30 mm Package Contents: Wheeler Scope Ring Alignment and Lapping Kit 1in/30mm Wheeler Scope Ring Alignment and Lapping Kit Combo - 30mm and 1 in - 305172