#78–#74 Carbide Micro Drill Set, 50 Pc, 5 Sizes, 10 Each, 1/8" Shank | S3A

50-Piece Carbide Micro Drill Set – #78 Through #74

This 50-piece solid carbide micro drill set includes 10 drills each of 5 consecutive numbered sizes: #78, #77, #76, #75, and #74. The included diameters range from .0160" through .0225".

This selected-size assortment is useful for PCB drilling, electronics work, fine-detail CNC machining, model making, precision repair, carburetor jet work, and other applications where multiple drills of these commonly used small sizes are needed.

The S3A set is not a full incremental assortment. It provides ten drills of each included size, making it a practical choice for repeat drilling, replacement inventory, or production work involving this specific size range.

Use the option selector to choose between Lightly Used Drills and Factory Resharpened Drills.

Best For

• PCB drilling and electronics prototyping
• Fine-detail CNC and precision drilling
• Model making and repair work
• Small-hole drilling in plastics, composites, and suitable non-ferrous materials
• Carburetor jet sizing and other precision orifice work
• Applications requiring multiple drills of the same five sizes

Set Summary

Included Sizes – 10 Drills Each

Flute lengths for new drills are shown in the product images when available. Resharpened or used drills may vary.

Benefits

• 50 total drills with 10 drills per included size
• Five consecutive numbered sizes from #78 through #74
• Useful for repeat work where extra drills of the same sizes are needed
• Standard 1/8" shanks fit many PCB drill holders, CNC collets, and precision drilling setups
• Choice of economical lightly used drills or factory-resharpened drills

Important Use Note

Solid carbide drills are rigid and wear resistant, but they are also brittle. Use a stable holder, low-runout spindle, drill press, mill, CNC machine, micro drill fixture, pin vise, or other controlled setup. Keep the drill aligned with the work and avoid side pressure, bending, or forcing the tool.

The exact drill style, flute length, point geometry, manufacturer, ring color, and cosmetic appearance may vary across the assortment. The included diameters and quantities are shown in the size chart above.

👉 View Carbide Drill Bit Feed & Speed Starting Guide