The Leupold 120978 model features robust LRW cross-slot rings that are constructed from strike forged steel, assuring unbeatable strength and longevity. These attributes make this fine piece of American manufacturing a testament to durability. Optimal alignment to weaver-style bases is assured thanks to Leupold\'s precision CNC machining. This eliminates any issues with slipping through the integration of anti-slip grooves, thus removing the necessity for lapping.Invulnerability to recoil or vibration is delivered by durable LRW ring screws with Nylok that guarantees against backing out. The model is completed with 30mm high rings and is beautifully finished in matte black.