Check the listing for details. Dovetail See-Through Low/High Riser Base 20mm Picatinny Weaver Rail Scope Mount. Condition: New. Listed at 13.01 USD. Extended Flat Top Scope Mount Base 1/2'' Riser Weaver Picatinny Rail 20mm Description: Material: Aluminum Alloy Length: Approx. 145mm (Approx 5.71inch) Height: 18mm (Approx 0.71inch) Rail Width: 20mm (Approx 0.79inch) Base width: 20mm (Approx 0.79inch) Features: Quick Detachable Design allow instant attach & detach action. Full Metal Construction. 20mm Top picatinny/Weaver Rail allow installation of scope / sight / Red Dots Sight. Perfect for Hunting & Skirmish Play. See Through design allows the users to see the iron sights when mounted. Length: Approx. 145mm (Approx 5.71inch). Height: 18mm (Approx 0.71inch). Rail Width: 20mm (Approx 0.79inch), Base width: 20mm (Approx 0.79inch). Precision Machined from Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish Package: According your choice from listing. Note:Pls check the size carefully before you buy. Extended Flat Top Scope Mount Base 1'' Riser Weaver Picatinny Rail 20mm Features: ---Quick Detachable Design allow instant attach & detach action. Full Metal Construction. ---20mm Top picatinny/Weaver Rail allow installation of scope / sight / Red Dots Sight. Perfect for Hunting & Skirmish Play. ---See Through design allows the users to see the iron sights when mounted. ---Length: Approx. 145mm (Approx 5.71inch). Height: 31mm (Approx 1.22inch). Rail Width: 20mm (Approx 0.79inch), Base width: 20mm (Approx 0.79inch). ---Precision Machined from Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish Description: Material: Aluminum Length: Approx. 145mm (Approx 5.71inch) Height: 31mm (Approx 1.22inch) Rail Width: 20mm (Approx 0.79inch) Base width: 20mm (Approx 0.79inch) Package: According your choice from listing. Note:Pls check the size carefully before you buy.