This is a set of 12 cork borers ranging in size from 4mm to 20mm. They are made from nickel-plated brass, and feature individual handles and a rod for cleaning borers. The set allows you to bore holes in corks to fit them with the appropriate glass tubing or thermometer. Helpful for any chemistry lab setting or for use in the classroom.
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Build your own 10 inch kaleidoscope with this great kit!