If you are doing woodworking, this set of cork drill do the job well. They are easy, reliable and simple to use. Very helpful in making great plugs.

Features:
Apply to the bench drill.
Decent quality and brand new.
High carbon steel with quenching treatment.
Includes 4 sizes(6mm, 10mm, 13mm, 16mm) in one plug cutting set.
Durable professional bored hole tool, which very helpful for wood plug cutting.

Specifications:
Material: High carbon steel
Shank Diameter: 8mm (round shank)
Package Weight: Approx. 111g / 3.92oz
Package Size: Approx. 10.5 * 6.5 * 2cm / 4.13 * 2.56 * 0.79in

Package List:
4 * Wooden Plug Drill

Note:
Rotate speed shoulds not be too high.