Check the listing for details. 2Pcs 1''/30mm Rings Adjustable Center Height Scope Mount for 20mm Picatinny rail. Color: Black, Condition: New. Listed at 18.99 USD. eBay Product Description Description: Model: 3020_QD Color: Black Material: High quality aluminum Feature: The ring Mount has the function of height adjustment and quick removal. It is suitable for 20mm standard Picatini rails and 30mm and 1-inch rifles. The rifle frame is made of aircraft grade 6061 aluminum alloy and has been processed by precision CNC (tolerance:+/-0.01 mm) to ensure accuracy and durability. Details: Model: Picatinny/dovetail rifle mirror ring, height adjustable Net weight (1 set): 90g Center height: 32 mm to 38 mm (1.26 inches to 1.5 inches)/36 mm to 42 mm (1.42 inches to 1.65 inches) black Pipe joint: 25.4mm/30mm (1 inch/1.18 inch) Guide rail matching: 20mm standard Picatinny guide rail Please carefully compare the size of our products and the installation dimensions of your equipment before buying. Package: 2pc adjustable height Mount 2 rings 25.4mm