Good strong meaty connection cables to join FLT cells. M10 thread and the cable itself looks like 35mm2 or thereabouts. The bolt heads are coated in plastic so when you put your spanner down on the cells it doesn't short and send molten metal spraying everywhere. Cleverly there is a tiny hole in the top so that you can put a volt meter probe in to measure the specific cell voltage. Personally I would rather see the bolt made from Copper or Brass but it's not a big deal.
MM - Betws-y-Coed, United Kingdom -