Key benefits - Drill and countersink or counterbore a pilot hole in wood in a single operation without changing bits. - Adjustable counter sleeve depth controlled by a hex key wrench for precise screw head seating. - Spiral flute design aids fast, efficient chip removal for cleaner holes. What you get - 7 piece set with pilot hole bits sized for screw diameters: - 5# 1/8" - 6# 9/64" - 7# 5/32" - 8# 11/64" - 9# 3/16" - 10# 13/64" - 12# 7/32" - Each bit is paired with a countersink/counter bore capability for flush or recessed screw heads. Material and construction - Drills made of HSS 4241 for hardness and durability. - Stop collar made of carbon steel for wear resistance and repeatable depth settings. - High hardness, rustproof, solid and durable construction. Applications and suitability - Ideal for woodworking projects requiring a countersunk bolt or flush screw head finish. - Tapered drill bits offer greater gripping power than standard bits, improving hole quality and screw seating. - Suitable for tasks where precise countersink depth and clean exit holes are important. How to use (brief) - Select the appropriate bit for your screw size. - Use the hex key wrench to set the desired counter sleeve depth. - Drill the pilot hole and countersink or counterbore in one step for a flush screw head without changing bits. Performance notes - Spiral flute design enhances chip removal for smooth operation and cleaner holes. - Precision depth control helps ensure consistent results across multiple holes.