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The large high current electrical connections on these capacitors have an anti-tamper type design, a round nut with 3 small flats on them, that will not allow standard socket to fit. Thus solves this problem with the tri-lobe design being shaped to fit the nut perfectly, while the open sided design allows the socket to fit in the limited space around the capacitor fixings.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.