SNIPER&reg; 3/8" Dove Tail .22 to Mil Spec 1913 Picatinny / Weaver Adapter; Upgrade Air Rifle 3/8 Dove Tail .22 Conversion to Picatinny Rail System Fits Dovetail 11mm - 15mm (adjustable) Add standard fit accessories. Attaches to Dovetail rail. Easy to install. 9 slots TOP 6061 Aircraft Aluminum and T6 Heat treated Height 0.67" x Width 1.02" x Length 3.9" Weight 2.4 oz