A good seal is the key to successful home canning. Ball's band tool is designed to apply the correct force to tighten your bands securelyh. Fit the lid and your band on your canning jar, place the bottom of this ring tool on top of the band, push down handle and turn to the left. Can be used on both regular and widemouth jars. 9-3/4" long with handle x 3-3/4" wide.
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