Size (length*width*height): 5cm x 7cm x 5cm

Allows to mount one standard GoPro like hero 4/ 5 6 and a small size gopro session on the same horizontal level . While two standard size gopro can only mount one face forward and one back to record immersive footage simultaneously.can put a fill in light and a sport camera together, helping you take immersive photos in the dark.Fits GoPro Monopod Selfie Stick, GoPro Head Strap, GoPro Chest mount harness and most GoPro Hero accessoriesMade of high quality material, durable and sturdy.

Specification
Compatible:for GoPro Hero 4/3+/3/2/1 SJCAM
Material: ABS
Item Size: 9 * 2 * 2.1cm / 3.4 * 0.8 * 0.8in
Item Weight: 15g / 0.6oz
Package Size: 39g / 1.4oz
Package Weight: 12 * 8 * 2.1cm / 4.7 * 3.1 * 0.8in

Note:
The sport camera and other accessories showed are for presentation purpose, they are not included.
unable to mount 2 action cameras side-by-side and facing forward.
Package List:
1 * Dual Camera Holder