Dimension: Dove rail length 68mm, top picatinny rail width 20mm, bottom width 11mm, height: 2cm (bottom from base to rail)Material: Made of high durability aluminum alloy in matte black. Durable, impact and corrosion resistant.Rail Adapter: Specially designed to convert an 11mm rail base to a 20mm rail base. Ideal for 11mm base and 20mm weaver/picatinny mount accessories.Riser Design: The mount allows the height of the flattop to be increased for easy aiming. Help you lock the target easier.Multiple Rails: The top weave rail of the adapter can be separated for the riser, dovetail rails on both sides for installing additional items .", Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.