Cork borers are a laboratory tool designed to cut a hole in a cork or rubber stopper to insert glass tubing. These products are available as a set, with handles, and as machines.
Product Type: Cork Borer. Diameter (English) Outer: 0.18 to 0.31 in. Diameter (Metric) Outer: 4.8 to 7.8mm For Use With (Application): To bore holes in corks and Rubber stoppers.