SNIPER Dovetail to Weaver Tactical Rail Base Mount 3/8 Fits onto Dovetail Rail - Fits 9mm up to 15mm 6061-T6 aluminum alloy, high quality material Puts 9 Picatinny width slots over a Dovetail rail Height: 0.67 IN; Width: 1.02 IN; Length: 3.9 IN; Weight: 2.4 OZ Easy install Secure fit