Quick Release 1/2 Inch Rail Riser Raise flat rail line or sight by 1/2 inch 2 1/2 inches (5 Picatinny rail slots) in length with a Picatinny standard rail mount Will accommodate Picatinny or Weaver standard red dots， scopes， and other optics Locks securely in place with quick release lock. Easy to install and detach， no tools needed Fit standard 20mm Picatinny rails Durable all metal construction Lightweight， made of aluminum with black anodized matte finish Adjustable locking tensionSpecificationsDimensions :1" (height) x 2.5" (length) x 30mm (width)Weight 81g (2.9oz)Material :Aluminum， Steel Finish: Black MatteInterface: 20mm Picatinny / Weaver RailsItems IncludedOne (1) 1/2" x 2 1/2" rail riser / mount(The rail base shown in the pictures is for reference purpose only. It is NOT included)