These clamps are part of the WECK canning system, they are for use with all Weck jars. Weck clamps are reusable.For storage 2 clamps are adequate, for preserving 3 clamps are recommended.Note: these are sold individually, the price is for one only clamp.ReadWecks Tips & Tricks to Preserving Blogfor everything you need to know before you get preserving at home

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