9 PCS Countersink Drill Bit Set, DIY Woodworking Drill Bits

The XCMVCN 9-Piece Countersink Drill Bit Set is designed for woodworkers and DIY builders who need to pre-drill pilot holes and flush countersinks in a single step. It covers five distinct bit dimensions ranging from 1/8 by 3/8 inches to 3/16 by 1/2 inches. By pairing pilot drilling with countersinking and including a 1/4-inch hex screwdriver bit, this kit streamlines tasks like assembling furniture, hanging cabinets, and mounting hardware.

Drilling performance relies on TCT tungsten carbide tipped countersink cutters, engineered to produce clean 82-degree recessed holes without tearing the workpiece. The pilot holes are guided by two-flute HSS M2 bits that resist bending or breaking under pressure. The cutting heads feature a precision helical grind, making the bits suitable for dense hardwoods, plywood, MDF, particle board, and even aluminum sheets.

Depth control is managed by an adjustable stop collar with a side-opening design. When the collar meets the wood surface, it instantly stops rotation to prevent over-drilling, friction burns, and surface scratches. Using the included hex wrench, you can dial in drilling depth up to 1.3 inches and countersink depth up to 0.5 inches, ensuring uniform screw seating across large decking or cabinetry jobs.

A notable trade-off is the recommended operating speed. To achieve smooth, burr-free edges, the manufacturer specifies running your drill at a low speed around 200 RPM, which may require deliberate trigger control on standard drills. Additionally, the set maxes out at a 1.3-inch drilling depth, meaning deeper structural framing will require different tooling.

Verdict: This versatile 9-piece set is an excellent choice for cabinet makers, furniture builders, and home renovators looking for clean, repeatable countersunk holes. Its durable carbide edges and depth-limiting collar take the guesswork out of flush screw installations.

• Piece Count: 9 pieces
• Bit Sizes: 1/8"×3/8", 9/64"×3/8", 5/32"×3/8", 11/64"×1/2", 3/16"×1/2"
• Cutter Material: TCT Tungsten Carbide Tipped
• Pilot Bit Material: HSS M2 (Two-flute)
• Countersink Angle: 82 degrees
• Shank Type: 1/4-inch hex shank
• Drilling Depth Range: Up to 1.3 inches
• Countersink Depth Range: 0 to 0.5 inches
• Recommended Operating Speed: Around 200 RPM
• Compatible Materials: Plywood, MDF, particle board, hardwood, aluminum

A great fit if you:

• Build cabinets, decks, or assemble flat-pack furniture and need flush screw heads.
• Work across mixed materials like hardwood, MDF, particle board, and aluminum.
• Want an adjustable depth stop to eliminate surface scratches and over-drilled holes.
• Prefer 1/4-inch hex shanks for fast switching between drilling and driving.

Consider something else if you:

• Need to drill pilot holes deeper than 1.3 inches.
• Routinely run drill bits at high speeds above 200 RPM.

What materials can these drill bits cut through?
They are designed to work on hardwood, plywood, MDF, particle board, and aluminum.

What drill speed should be used with this set?
For smooth, burr-free cutting edges, run your drill at a low speed of around 200 RPM.

How deep can these bits drill?
Using the adjustable collar and wrench, you can set the drilling depth up to 1.3 inches and the countersink depth between 0 and 0.5 inches.

What accessories come in the storage case?
The case includes five countersink drill bits, an adjustable depth stop collar, a hex wrench, and a 1/4-inch hex screwdriver bit.