If you are looking for a set of countersink drill bit that has decent quality, this one is it.

Features:
Carbon steel, high quality with good durability for daily use.
An essential hardware tool for the DYI'er or the professional wood worker.
These countersink drill bits works great in wood bore holes and chamfering.
It includes 2 sizes in one countersink drill bit set(4mm/6mm, 5mm/7mm), which meet your different needs perfectly.
Very convenient to change the bits with the included mini hex wrench which loosens and tightens the bits to hold and release as needed.

Specifications:
Material: Carbon steel
Round Handle Diameter: Approx. 8mm / 0.31in
Package Weight: Approx. 63g / 2.25oz
Package Size: Approx. 10 * 6.5 * 1.5cm / 3.94 * 2.56 * 0.59in

Package List:
2 * Countersink Drill Bits
1 * Hex Key