We are all aware of what a riser does, it's in the name but what it also does is waste space, not anymore. This simple but one of a kind product adds function to the riser. By leaving the middle area hollow it allows the user to place whatever they want there. It's great for battery storage either a lipo or a powerbank for an acton camera (this one fits just right and I recommend it http://amzn.to/2bHwlpz). Alternatively you could also keep a bag of small tools, extra BBs or even a snack in there.
The BEC Riser is a one piece design with a hinged front door. Simply slide or spread the riser over a picatinny or a weaver rail and lock it down with 2 nuts and bolts (not included #8 1-1/4"). Front door hinges up to swing out of the way and allow full access to the interior. To lock the door swing it down and squeeze the side tabs until it fully closes and the inner protruding bits line up, it stays firmly closed.
The length (12cm or 4.75") of the riser is adequate for most standard scopes and sits discretely underneath giving an additional 4cm or 1.5" or rise, best used with low profile scope rings. Inner space is 2.3cm x 2.3cm x 11cm or 0.9" x 0.9" x 4.3" Be sure you have at least 11 recessed / 12 raised rail spots to accommodate the length of this riser.