I thought these would be great for a clean looking safe setup for my x4 UT1300's. Biggest issue is the tray is generic in size and not at all form fitting to the batteries themselves. They have a good inch of play in either direction when fully tightened down. So in general not very tight at all. One of the straps for the battery tray came broken as well. I reached out to Lion, but no luck on getting a new one so I ended up using an old strap I had lying around. For the price of the trays (4 of them adds up pretty quickly), I do not think it is worth it. My batteries were more secure previously using the foam that came with the batteries and some secured straps that I just kind of pushed / wedged together. Being fully bolted down, and strapped, the batteries have a lot of movement and play which is not what I was looking for. If the trays were actually sized to the battery itself, I think they would be great, just way to much wiggle room.