Countersink Drill Bit - 90 Degree HSS 5 Flute Countersink Drill Bit Set 1/4'' Hex Shank for Wood Quick Change Bit by MoArmor

Feature:

☆countersinking is a two-step process: pilot hole first, followed by the countersink.
It's effective, but time consuming.
However, a wide variety of combination countersinks do both tasks at the same time.

☆The most important thing to keep in mind when using a countersink is to match the size correctly to the screw being used.
A too-large countersink will swallow the head of a screw in what will look like a moon-sized crater;
A too-small countersink won't fit the screw head, and forcibly driving the screw in can tear the wood fibers around the countersink.

☆If you don't drill the countersink deep enough, the screw will remain proud of the surface;
go too deep and the screw will seat too shallow.

Product Specification:

Material:High Speed Steels
Size:6mm,8mm,12mm,16mm,19mm
Quantity: 6 Drills

Package include:

1 x 6mm Drill
1 x 8mm Drill
1 x 9mm Drill
1 x 12mm Drill
1 x 16mm Drill
1 x 19mm Drill