Square Tenon Drill Bit Set CNC-Milled Carbon Steel 4-Piece
High Quality
Free US Shipping
Hassle Free Returns
Exact square tenon holes without rough edges or rework
Produce precise, clean square tenon holes in wood — CNC-milled edges for smooth cuts, chip removal design reduces drilling resistance
Why is this square tenon drill bit set perfect for you?
✔ Durable carbon steel construction: The set is made from carbon steel that maintains sharp cutting edges even after repeated use, ensuring long-lasting performance and fewer replacements.
✔ CNC-milled cutting edges for clean results: Precisely CNC-milled edges produce smooth, sharply contoured square tenon holes, minimizing the need for additional finishing or rework.
✔ Chip removal design for faster drilling: The specialized chip removal feature reduces resistance during drilling, resulting in faster, more controlled cuts and less effort required.
Specifications
Material: Carbon steel
Included sizes: 1/4" (6.4 mm), 5/16" (8 mm), 3/8" (9.5 mm), 1/2" (12.7 mm)
Compatibility: Fits most common drills via drill adapter holder sold separately
Suitable for: Wood and wood-based materials
Frequently asked questions
Quick answers about ordering from Couje. More detail on our full FAQ page.
How much does shipping cost, and how long does it take?
Shipping is free on every order — no minimum. Orders are typically delivered within 4–12 business days (processing included), and every order includes tracking. Full details are in our Shipping Policy.
What is your return policy?
You can return items within 30 days of delivery. Once your return is received and inspected, we process your refund to the original payment method. See our Return & Refund Policy for the full process.
How do I track my order?
As soon as your order ships, we email you a tracking number. You can follow your delivery at any time on our Track Your Order page.
How can I reach customer service?
Email us at support@couje.com or use our contact form. Our team is available Monday – Friday: 09:00 AM – 05:00 PM EST and replies within 24 hours. Saturday – Sunday: closed.