"Purchased these before from SF and had no problems but SF must have changed supplier.
Previous ones had double crimping sleeves. These do not.
These ones do not get a tight grip and can be pulled apart. I used a pro crimper. Frustrating and very costly in time.
Interestingly, since coming back to the SF website to check, in the spec' they do not say they conform to BS4579 or BS4G178, which is the British Standard for the specification and performance of mechanical and compression joints in electric cable and wire connectors.
I hope this info' helps others because you have to have confidence on your electrical connections."
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Review 3 for Insulated Crimp Ebb Blue Butt Pack of 100