Adjustable Countersink Drill Bit Set

🛠️ Adjustable Countersink Drill Bit Set — Prepare Pilot Holes & Recess Screw Heads

Get your next woodworking project ready for a cleaner screw finish. This five-piece Adjustable Countersink Drill Bit Set combines pilot drilling and countersinking in one setup, helping you prepare holes for matching countersunk screws with fewer tool changes. Use it for projects in solid wood, particleboard, MDF, and PVC.

🔩 Drill the Pilot Hole and Shape the Recess

Each assembly pairs a central pilot drill with a countersink cutter to prepare both the hole and the recess around its opening. This helps matching screw heads sit flush with the surface when the countersink depth is set correctly. Titanium-coated pilot bits and 1/4-inch hex shanks complete the setup for use with compatible drill chucks or bit holders.

⚙️ Adjust the Pilot Bit to Your Task

Loosen the retaining screw with the included Allen wrench, adjust the pilot bit’s projection, then tighten it securely before drilling. The through-bore holder allows the central bit to be repositioned or removed, giving you flexibility when setting up for different pilot-hole depths.

🌀 Give Drill Chips a Path Out

The pilot bits feature spiral flutes that provide a path for chips to move out of the hole as you drill. This supports chip clearance during hole preparation for shelf parts, furniture components, and other DIY projects.

📏 Five Pilot Sizes in One Set

Choose from five labeled assemblies: #5 with a 5/64-inch pilot bit, #6 with 3/32 inch, #8 with 7/64 inch, #10 with 1/8 inch, and #12 with 9/64 inch. All feature a 1/4-inch hex shank. The set includes five countersink drill assemblies and one Allen wrench.

These measurements refer to the pilot-bit diameters. Select the size to suit your screw and material, and check the countersink fit on a scrap piece before working on your finished part.

🛒 Get Ready for Your Next Screw-Fastened Project

Add this set to your toolbox and keep five pilot-hole sizes ready for your next build, repair, or furniture project.

🚚 Shipping: US$5.99. Free shipping on orders of US$80 or more.