Onstructed from Precision Machined Aircraft Grade Aluminum Alloy. Fits on Most Pistol Accessory to Provide a Solid Style Platform for Most Optics. Provides A Standard 7/8" 10 Slot Top See-Thru Designed 3 Slot Bottom - Picatinny For Attaching Scopes, Sights, light Specifications: Length 5 inches. Easy to Install , 2 Set Screws Lock Tight to Existing . Fits Pistols with Front Accessorie