Review on Ebike Controller Box Kit with Lithium Battery Case for Electric Mountain Bikes and Electric Bicycles by Shawn Jimenez

Yes, this box is small but well made, with brass inserts for mounting screws. Only really suitable for small 250-350W controllers. There isn't much room inside for ports or extra cables (which need to be carefully attached). But the small size doesn't take up much space on the bike, and the smaller slots on the bottom allow the right cables to pass through without letting dirt get in (and they seal easily with silicone).