Machined from aluminum Compatible with 20mm Picatinny rails Provides a raised mounting platform for micro red dot optics Manufacturer: Matrix Specifications: Dimensions: 2" L x 1.5" W 1.25" H Weight: 1.6oz Materials: Black Anodized Aluminum Compatibility: Fits all Standard 20mm Picatinny / Weaver Rails Package Includes: Riser, hex key for installation