Fits existing Dovetail mount - raising the mount 5/8 inches. The dovetail riser is 9 inches long (8 inches below and 8 inches above) and has a full length dovetail on top and along both sides to mount additional hardware. Matte black finish made of high strength aluminum alloy and comes with hex wrench.  Weight: 6.7 ounces.  New - LIFETIME WARRANTY - Ready to ship.