0.040"–0.125" Holley Carburetor Jet Drill Set – 50 Pc Factory Resharpened Carbide HS1

Holley Carburetor Jet Drill Set – 50 Piece .040"–.125"

This 50-piece factory resharpened solid carbide drill set is configured to cover a practical larger carburetor jet sizing range from .040" through .125". It is especially useful for Holley carburetor jet sizing, checking, tuning, and careful modification work where a broad range of small carbide drill sizes is needed in one organized set.

This range may also be useful for larger automotive carburetor jet work, including Rochester, Carter, Quadrajet-style, AFB/AVS-style, and similar carburetor applications. Always verify the required jet size for your specific carburetor and tuning setup before drilling.

Each drill features a standard 1/8" shank and 1.50" overall length. The set comes organized in a compact storage case with a full size chart label for quick reference.

Included Sizes – 50 Pieces Total

Includes 1 piece each of these sizes:

• .0400" — #60
• .0413" — #59 / 1.05 mm
• .0420" — #58
• .0433" — #57 / 1.10 mm
• .0441" — 1.12 mm
• .0453" — 1.15 mm
• .0465" — #56
• .0472" — 1.20 mm
• .0492" — 1.25 mm
• .0512" — 1.30 mm
• .0520" — #55
• .0531" — 1.35 mm
• .0551" — 1.40 mm
• .0571" — 1.45 mm
• .0591" — 1.50 mm
• .0610" — 1.55 mm
• .0625" — 1/16"
• .0635" — #52
• .0650" — 1.65 mm
• .0669" — 1.70 mm
• .0689" — 1.75 mm
• .0700" — #50
• .0709" — 1.80 mm
• .0728" — #49 / 1.85 mm
• .0748" — 1.90 mm
• .0760" — #48
• .0787" — #47 / 2.00 mm
• .0807" — #46 / 2.05 mm
• .0820" — #45
• .0827" — 2.10 mm
• .0846" — 2.15 mm
• .0860" — #44
• .0866" — 2.20 mm
• .0906" — 2.30 mm
• .0925" — 2.35 mm
• .0938" — 3/32"
• .0945" — 2.40 mm
• .0960" — #41
• .0965" — 2.45 mm
• .0980" — #40
• .0995" — #39
• .1004" — 2.55 mm
• .1015" — #38
• .1024" — 2.60 mm
• .1043" — #37 / 2.65 mm
• .1083" — 2.75 mm
• .1102" — #35 / 2.80 mm
• .1161" — #32 / 2.95 mm
• .1181" — 3.00 mm
• .1250" — 1/8"

Specifications

• 50 pieces total
• Size range: .0400" through .1250"
• Factory resharpened solid carbide drills
• Standard 1/8" shank, also known as 3.175 mm
• 1.50" overall length
• Set ID: HS1
• Organized storage case with size chart label included
• Reference image shows drill style and dimensions only; actual included sizes are listed above.

Common Uses

• Holley carburetor jet sizing and tuning
• Rochester, Carter, Quadrajet-style, and AFB/AVS-style carburetor jet work
• Larger automotive carburetor jet checking, matching, and careful enlargement
• Main jet sizing and careful modification
• Precision small-hole drilling in brass and similar soft-metal metering parts
• Checking, matching, or stepping up drill sizes

Factory Resharpened Solid Carbide Value

These are factory resharpened solid carbide drills, offering performance comparable to new drills at a lower cost. They are professional-grade micro drills with standard 1/8" shanks, intended for stable, accurate drilling setups where rigidity and precision matter.

Unlike lightweight hobby-style wire drill assortments, these are solid carbide micro drills with full 1/8" shanks and are packaged in an indexed storage case for organized size selection.

Use note: Solid carbide drills are precision tools that require a stable setup. For best results, use a pin vise, drill press, milling machine, micro drill fixture, or other controlled holder that keeps the jet square to the drill. Avoid handheld electric drills, side pressure, bending, or forcing the drill.

Important Jet Tuning Note

Drilling a carburetor jet is a permanent modification. Increase size gradually and do not skip too far at once. For the most exact fuel-flow work, remember that jet flow can depend on more than the hole diameter alone, including the entry shape, exit shape, and finish of the jet.

Frequently Asked Questions

Are these new drills?
No. These are factory resharpened solid carbide drills, offering performance comparable to new drills at a lower cost.

Is this set specifically for Holley carburetor jets?
This set is configured around a practical Holley carburetor jet sizing range from .040" through .125". It may also be useful for other larger automotive carburetor jet work, including Rochester, Carter, Quadrajet-style, AFB/AVS-style, and similar applications. Always verify the required jet size for your specific carburetor and tuning setup before drilling.

Is this the best set for small motorcycle, scooter, RC, or small-engine carburetors?
Not usually. For many smaller carburetor jet jobs, the 20 Pc Selected Sizes set, 25 Pc #75–#51 set, or D7 #80–#56 set may be a better starting point. This HS1 set is focused on a larger .040"–.125" range.

How many drills are included?
This set includes 50 drills total: 1 piece each of the listed sizes from .0400" through .1250".

Are these solid carbide or carbide tipped?
These are solid carbide micro drills, not carbide-tipped drills.

Can I use these by hand?
They can be used carefully in a pin vise or other controlled holder, but carbide drills are brittle. Keep the drill straight, use light pressure, and avoid side loading.

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