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I could only use one of these spanners to tighten the mc4's that I had bought online, because only the centre hole would fit the barrel part. I had to use my hand to turn the actual nut, as the other openings of the spanner wouldn't fit. The two spiky bits on the spanner did make separating the plugs a doddle though. A good quality product that appeared to be well made. Maybe I've bought dud mc4's and there's nothing wrong with the spanners after all.
Verified purchase: Yes | Condition: New