EZARC 8 Piece Countersink Drill Bit Set | HSS Tapered Wood Pilot Bits #4–#12 | 82° Countersink, Stop Collars & 1/4 Inch Hex Shanks

EZARC Countersink Bits for a Neater Woodworking Finish

Prepare pilot holes and screw-head recesses with the EZARC 8 Piece Countersink Drill Bit Set. Five tapered drill-and-countersink assemblies cover screw sizes #4 through #12, bringing the pilot bit and countersinking cutter together in one setup. Two stop collars and an Allen key complete the pictured eight-piece kit, giving you useful adjustment options for furniture, cabinetry and everyday wood projects.

Why You'll Love It

• Prepare the hole and the screw seat together. Each EZARC assembly combines a tapered pilot drill with an 82° countersink. Set up correctly for a compatible screw, it helps create space for the shank and head without swapping between separate pilot and countersink tools for each hole. Deeper recesses can be used where the project calls for counterboring.
• Set the depth for repeat work. Adjustable cutter positioning and the supplied stop collars help you establish a repeatable setup. Make a test hole in matching scrap, check the screw seating and tighten the adjustment screws before working on your finished piece.
• Five useful sizes, quick-change hex shanks. The #4, #6, #8, #10 and #12 assemblies have 1/4-inch hex shanks for suitable drill chucks or compatible quick-change holders. The supplier identifies tapered HSS pilot bits with nitrogen treatment and four-flute countersink cutters.

For the Details You Notice at the End

When a shelf, cabinet panel or small furniture project is nearly ready, proud screw heads can interrupt the finish. Choose the appropriate EZARC bit, test the depth and prepare each fixing position before driving your screws. A correctly sized recess lets a matching countersunk head sit neatly at or below the surface, depending on the result your project needs.

Bit Sizes

• #4: 7/64-inch pilot drill
• #6: 9/64-inch pilot drill
• #8: 11/64-inch pilot drill
• #10: 3/16-inch pilot drill
• #12: 7/32-inch pilot drill

These are the supplier's screw-size and pilot-diameter pairings. Check the actual screw, timber and required pilot size before drilling. The 82° countersink must suit the screw-head geometry; it is not a universal match for every countersunk screw.

Specifications

Brand: EZARC
Set size: Eight pieces: five bit assemblies, two stop collars and one Allen key
Application: Woodworking pilot drilling, countersinking and suitable counterboring tasks
Pilot construction: Tapered high-speed steel; described as M2 HSS in the supplied listing
Surface treatment: Supplier-described nitrogen / nitride treatment
Countersink design: Four-flute cutter, as illustrated
Countersink angle: 82°
Shank: 1/4-inch hex, quick-change style
Supported materials: Suitable softwood, hardwood, plywood, particleboard and fibreboard, as listed by the supplier
Tool compatibility: Suitable cordless, corded and bench drills with a compatible chuck or holder
Allen key: 1/8-inch, as stated in the source description
Stop collars: Two pictured; the source mentions 3/8-inch collar sizing but does not identify both collar dimensions
Item Ref: 81a9f5e7-af87-41ca-ad2d-1be9303a2480

In The Box

• 5 × EZARC tapered pilot drill and countersink assemblies: #4, #6, #8, #10 and #12
• 2 × Stop collars
• 1 × Allen key

This is an eight-piece accessory set, not eight drill bits. Drill, screws, timber and other workshop equipment are not included. No storage case is shown or specified.

Use & Care

Wear eye protection, clamp the workpiece securely and follow your drill's instructions. Disconnect power or remove the battery before changing bits or adjusting cutters and collars. Remove the Allen key before starting the drill. Check that the shank, bit and adjustment screws are secure, use an appropriate drilling speed and feed, and clear chips as needed. Use rotary drilling rather than assuming hammer or impact operation is suitable.

Test on matching scrap before drilling the finished piece; grain, material and technique affect the result. Keep hands away from rotating cutters and allow hot bits to cool before handling. Clean off debris after use, keep the set dry and inspect for damage. These are woodworking bits; suitability for masonry or metal cutting is not specified.