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A bit of a mystery, these. This set gave good heat and cranking results, and we don't doubt the 300 amps maximum current rating that the maker claims for it.
However, the 25mm cables themselves are nowhere near as supple as others in the group. The SIP 03996 also lost ground to its rivals for the semi-insulated clamps, which aren't as well sprung as they ought to be to provide a foolproof connection.