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This set of six cork borers allows you to make uniform holes in rubber stoppers and corks to meet a variety of laboratory needs. The standard holes in rubber stoppers are 3 mm or 5 mm depending on the stopper size. Often a larger hole is needed to attach glass tubing, thermometers, funnels, glassware, or other equipment. This set of six nickel-plated brass cork borers ensures you can always make the right size hole when you need it. You can also make your own holes in economical corks instead of pre-drilled rubber stoppers or just keep a few solid rubber stoppers on hand instead of pre-drilled stoppers in every size.
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