Description 100% brand new and high quality Name: Butterfly clip (can hold round pipe) Scope of use: Quick-release clip, flashlight clip, hiking clip, clip Size: 10mm-21mm pipe diameter, 20mm guide rail Material: Aluminum alloy Feature: The tube clamp is suitable for sight and flashlight , solid aluminum structure, hard black anodized matt finish. Maximum barrel outer diameter: 21mm, easy to install (including tools), comes with a wrench, right on your barrel. Very suitable for installing flashlights, sights, bipods, etc. Description: Durable all-metal structure, light weight. The fabric lining increases friction and protects your accessories. Fits standard 20 mm rails, adaptors for 1/2" to 1" barrels. Specifications: Depth: 20mm, height: 1.25" (rail mounting), height: 1.75" (barrel mounting), width: 1.5". 20-30mm adjustable. Fully installed base, suitable for any 20mm standard rail. Rail type: suitable for any 20mm braid/Picatinny base. Note: 1. As we all know ,the different computers display colors differently,the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size ,you can feel free to contact mewe will give you some suggestion,but it is for you reference only. 3.We could accept Mixed items,Colors And Sizes Order. The more quantities, the more Package Included: 1 set clip