No. They're for use when joining 10mm soft copper to a compression fitting.
Just to support over tighting of the copper?
So that insert goes inside 10 mm copper?!
So am I reading this right insert for 10 mm copper!!! I've just never seen it that's all!!!
10mm (soft) copper is not self supporting. 15mm lengths are normally half-hard so do support olives during compression. 15mm soft coiled copper would also in theory need inserts but is rarely used.

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