Stealthmounts battery holders are very easy to assemble. Our battery holder has three holes that can be attached to any place where you can screw it in. This battery storage organizer can be mounted on walls at any angle, upside down, under a shelf/ bench or on panels with screws-mount. There might be some divergence due to manual measurementSolid Injection molded ABS plasticUsed as a dust coverEasy to assembleCompact size and durableEconomic package of SixAvailable in Black, Yellow and Red colorsClicks securely into place, no excess rattleColor options can be used to signify dead batteries. Red = Dead