1. Mount on guide rail for sliding adjustment, suitable for 20MM guide rail slide the mount over the rail. 2. Easy to operate, With hexagonal set screws, you only need to tighten the screws to install and securely. 3. Picatinny vertical rails mount compatible with for , for action camera photography equipment accessories and 20mm rail. 4. Vertical rail mount for the main plastic made of nylon. Vertical Rail Mount For 13 12 11 10 9 8 7 6 5 4 for for For X2 X3 X4 Action Camera Accessories Compatible with: For 13 12 11 10 9 8 7 6 5 4 3 Black Max For one X2 / X3 / X4 For Action 1/2/3/4/5 For SJ4000 SJ5000 SJ6 SJ7 SJ8 SJ10 SJ11 M20 C100 C200 C300 For EK7000 V50 Brave For 4K+ / / And Other most action camera Note: This camera is not included. Color: Black Material: Plastic Package Contents: 2 * brackets 2 * screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.