【7-Piece Self-Centering Drill Bit Set】Includes 7 high-speed steel hinge drill bits in sizes: 5/64", 7/64", 9/64", 11/64", 5mm, 13/64", and 1/4". Each bit has a 1/4" hex shank compatible with most power drills, providing a complete solution for precise hinge and hardware installation. 【Accurate Centering for Precise Holes】Built-in spring ensures the drill bit remains centered during drilling, preventing wandering or slipping. Achieve clean, accurate holes for door hinges, drawer slides, cabinet hardware, and window frames every time. 【Automatic Chip Removal Design】Dual-side chip removal holes discharge wood chips automatically during drilling, preventing clogging, reducing heat buildup, and enabling faster, smoother drilling operations for both softwood and hardwood. 【Durable HSS Construction & Easy Replacement】Made of high-speed steel (HSS) with polished surface for long-lasting durability and wear resistance. Drill sleeve and bits are secured with hex screws, allowing fast and easy replacement when needed. 【Wide Applications & Wood Hardness Tips】Ideal for installing hinges on doors, windows, cabinets, and furniture. Perfect for professional carpenters, woodworking enthusiasts, and DIYers. Pro Tip: Use smaller bits for softwoods and larger or corresponding bits for hardwoods to ensure optimal drilling results.

Material: High Speed Steel

Type: Center Drill Bit

Surface Treatment: Polishing

Drilling Diameter: 2.2 MM~7.5 MM

Features:
- Brass and high-speed steel material, serviceable and excellent for use.
- Drill bush for precise positioning, will not shift.
- Sawdust will be automatically discharged from the top of the drill - Holes on both sides, not stuck drill.
- Unique design and perfect punch effect.
- Applicable to the installation of door hinge.
- Good tools for carpentry DIY or professional engineers.

Color: Silver

Size: 5/64", 7/64", 9/64", 11/64", 13/64", 5 mm, 1/4"
- Drill Hole Diameter Suitable Self-tapping Screw Size
- 5/64" 2 mm 2.2-2.8 mm
- 7/64" 2.8 mm 3-3.5 mm
- 9/64" 3.5 mm 4-4.5 mm
- 11/64" 4.5 mm 5-5.5 mm
- 5 mm 5 mm 5.5-6 mm
- 13/64" 5.2 mm 6-6.5 mm
- 1/4" 6.35 mm 7-7.5 mm

Place of Application:Power Tool Doors and Windows Core Drill Bit Set

Note:
- Please adjust according to hardness of the wood, if the wood is soft, choose a smaller size; if the wood is hard , you can choose a larger size or corresponding opening tool.