A pack of 12 Nickel-plated brass; variety of sizes of tubes each with cutting edge at bottom and handle at top. Set complete with cleaning rod.Cork Borer Diameters:Number 1: 4.7mmNumber 2: 6.3mmNumber 3: 7.8mmNumber 4: 8.9mmNumber 5: 9.8mmNumber 6: 11mmNumber 7: 12.7mmNumber 8: 14.2mmNumber 9: 15.8mmNumber 10: 17.5mmNumber 11: 19mmNumber 12: 20.5mm