Ultimate Arms Gear Pistol Handgun Scope Mount for Sights, Lasers, Lights and Accessories Fits Sig Sauer 226 229 220 P250 Sig Pro Pistols Constructed 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" 12 Slot Top See-Thru Designed & 3 Slot Bottom - For Attaching Scopes, Sights, light, lasers etc. Specifications: Length 5" inches. Weight 3 oz. Easy to Install. 2 Set Screws Lock Tight to Existing Rail.