FIRECLUB 2017 1" Inch Scope Mount Ring and Adapter, Tactical Flashlight Sight Mount Holder with 20mm Barrel Clamp Adapter for Rifle Picatinny/Weaver Mount Type Place: Barrel, Weaver, Picatinny Ring Diameter: 25.4mm Usage: Change your barrel to Picatinny Weaver ,Complete solution for Mounting Flashlight & Laser Sight & Rifle Scope on Rifle The low profile scope ring can also be installed on standard 20mm weaver alone,fully adjustable with nuts & screws included Pack in Lirisy Exclusive design packing box,make it different and special,good gift to your boy friend,father,grandfather.