I always give a product five stars just because I see no reason why my interpretation of what I want to see is less reasonable, things seem easy instead heavy as she said but that's just me, I also need a caliber 4/0 and this kit doesn't include it, I don't want to see the actual size in millimeters but I think it would be good for marine applications because it keeps it , but if you're looking for battery cable ends look closely at what's on the case, don't do what I did and just assume it's there, although I still have the larger size 6/ 0 will be the smaller ones Used for all the other connectors on my boat they are good but not in the way I thought. And it's not Revain's fault or the shippers' fault, it's my fault, but I can still use them and the price is good for the tinned ends and with heat shrink tubing. Hope that helps.