The manufacturer just doesn't do it justice. I noticed a few reviews that said a long set screw and a short set screw were needed. But the description says there are two. Maybe they were listening after this review. but anyway. When I first opened it. I was wondering how the 2 gauge cable would fit there. Loosen the set screw and the center comes out. To give you room for 2 AWG wires, the middle section is shown in the picture and another photo. Shown for 4 gauge wire. I'm sure you could use this with a smaller diameter wire. Say 6 AWG but the specs say 2 and 4. Might be a bit loose for smaller wires. In addition, the diameter of the fuse box is good. not much more than a 2awg cable. not a big bulky fuse box like some I've seen. It also comes with a 50 amp fuse installed. I ordered 5 packs of 200 amp mini fuses for my application. (from the insulator to the battery post) I am really impressed with the quality of this product. buy more for future products
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