Economy Cork Borer Set of 9 is made of steel tubing with attached handles including a steel punch rod.

This set of nine cork borers allows you to make uniform holes in rubbers stoppers and corks to meet a variety of laboratory needs. The standard holes in rubber stoppers are 3mm or 5mm depending on the stopper size. Often a larger hole is needed to attach glass tubing, thermometers, funnels, glassware, or other equipment. This set of nine steel 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.

nineiameters of the holes made, start with 5mm increasing with each different size used.

The sizes of borers included with this set are as follows:

• 1-Hole diameter: 5mm (13/16″)
• 2-Hole diameter: 6mm (1/4″)
• 3-Hole diameter: 8mm (19/64″)
• 4-Hole diameter: 9mm (11/32″)
• 5-Hole diameter: 10mm (25/64″)
• 6-Hole diameter: 11mm (7/16″) 
• 7-Hole diameter: 13mm (1/2″)
• 8-Hole diameter: 15mm (39/64″)
• 9-Hole diameter: 16mm (21/32″)