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HARFINGTON 33/64″ Drill Bit 3/8″ Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum 33/64 inch 3/8″ Shank
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What people love (and don’t love)
What people love
Sharp and effective for drilling various materials including wood, plastic, and metal.
Good value for money with a fair price compared to alternatives.
Durable enough to complete multiple holes without trouble.
Does not damage softer materials like PVC pipe.
Works well for general-purpose drilling needs.
What people don’t love
May struggle with very hard or hot rolled steel, leading to wear on the bit.
Some users report the cutting edge may need sharpening or adjustment.
Not perfectly ground in every unit, causing slightly off cuts.
Reliable and sharp drill bit with good value, best suited for softer materials and general use rather than very hard metals.
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)
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