I bought these because they looked great and I thought they would be easy to use. The problem was that the cables (4 gauge) didn't go in deep enough and they would not stay in. It seemed that the clamping screw spread the strands of the cable rather than clamping down on them. I wound up using crimp-type connections I bought locally, which didn't look as good but worked better. The other problem with these is in the design of the battery connection end. Because it is made in the center of the connector it had to attach vertically to the battery terminal rather than horizontally parallel to the battery cable. If the connection was offset you would have more options when you attach it to the battery.