HARFINGTON 33/64" Drill Bit (3/8" Reduced Shank, 4241 HSS, 118°)

What people love (and don’t love)

What people love

Good quality and sharp for easy drilling through various materials including hardened steel and wood.
Cost effective and good value for the price.
Durable and works well for multiple holes without trouble.
Reliable and performs as expected for its size and purpose.
Positive reviews emphasize solid performance and satisfaction with the product.

What people don’t love

Some users experienced rapid wear and deformation within minutes of use.
Reports of the bit failing to remove material properly, leading to frustration.
Minor remarks about the necessity of oiling the bit for best performance.
A small percentage of customers gave low ratings indicating quality inconsistency.

Overall, the HARFINGTON 33/64″ Drill Bit is a sharp, cost-effective tool praised for durability and performance, though a few users reported quality issues.

Summary based on customer review evidence.

Check price on Amazon

Quick facts

Brand: ‎HARFINGTON
Price: USD 9.99
Rating: 4.50 (207 reviews)

If you need a larger cutting diameter but want it to fit a more common drill chuck, the HARFINGTON 33/64″ drill bit pairs a 33/64-inch cutting edge with a 3/8-inch reduced shank. The 3-flat shank design helps improve grip in the chuck, making it a practical option for DIY, woodworking, and home repair tasks.

You can view the current price and full details on Amazon here.

Built from 4241 high-speed steel (HSS) and finished with a nitriding black surface treatment, this bit is designed for hardness, wear resistance, and improved corrosion resistance during everyday use. The 118° point angle is a general-purpose geometry that helps the bit start and drill efficiently in both wood and common metals.

Best uses: wood, plastic, and medium-hardness materials such as copper, aluminum, and iron. For best results, keep the drill perpendicular (90°) to the workpiece and drill a small guide hole first when stepping up to larger holes. Note: this bit is unsuitable for stainless steel.

33/64″ cutting diameter with 3/8″ reduced shank and 3-flat grip for better chuck hold
4241 high-speed steel construction for hardness and wear resistance
Nitriding black finish to enhance wear and corrosion resistance
118° point angle for general-purpose drilling in wood and common metals
Suitable for wood, plastic, copper, aluminum, and iron (not stainless steel)