Item Name:Dual Ring Cantilever Scope Mount Fuction:Scope Installation Fit for:0.79inch(20mm) Picatinny Rail Feature:Empty body design Type:Scope Mount Sight Mount Style:Heavy Duty , Dural Ring Rail Width: 0.78inch (20mm) Item Size: 2.36inch x 5.9inch(150mm x 60mm) Diameter: inside 0.98inch(25mm) outer ring 1.18inch(30mm) Net Weight: 194g Note:The drawing shows the effect drawing, and only the level pipe clamp is actually delivered. Color:Black Material:Aluminum Alloy Package Contents: 1 * Level tube clamp Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.