Product Features Includes Low, Medium, High, Extra High Heights Vibration Dampening System Product Specifications Heights Included: Low, Medium, High, Extra High Scope Tube Size: 30 MM Adapter: Four-Way Locking System Shock Dampening System Fits Weaver or Piccatiny Drive: 7/64 Hex Top Screw IN/LBS: 15 Max. Bottom Screws IN/LBS: 25 Max. Material: 6061-T6 Aircraft Aluminum Weight: Color: Matte Black