Do the holes have threads so you can screw in a bolt?

Yes. The gauge is a thin piece of plastic and each hole is threaded. There is, of course, a limited number of threads because the plastic is thin. I believe it should be used gently to avoid damaging plastic threads. I believe it will be useful for identifying whether a screw has one standard thread (such as 1/4-NC20) or another standard thread (such as 1/4-NF28), but I don't think it can be used to finely test accuracy of threads cut on a lathe. I have not had an occasion to use it yet.

what is the thickness of this gauge?

My micrometer says it's about a quarter inch. The only caveat is it is a polymer gauge, good news is that means it's durable and can flex around truly messed up screws and bolts; the bad news is it's not super precise because it's not stainless or Ti. For example it might be hard to discern a 24 vs. 28 pitch thread, but in my experience in the machine shop it determines the right threading well especially when you are trying to match a screw that's broken, old or damaged.

will this guage work for very small computer screws ?

Yes! The guage goes down to M1.4 which is much smaller than any fastener that your going to find in any computer. The guage also has inch sizes down to #0 (.060 inch). Mike

Why do they show two different kinds of cards in the picture? One says "pitch" at the top right, and the other says "drill". Which one do we get?

The pitch is for metric screws.

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Screw Thread Gauge | Metric and SAE | Recommends Drill Bit & Tap Size (BCP675)

Screw Thread Gauge | Metric and SAE | Recommends Drill Bit & Tap Size (BCP675)

Product ID: 92271026

Details

Exterior Finish
Plastic
Head Style
Round
Material
Plastic
Point Style
Fein
Thread Size
0-80

📏Dual Metric & SAE precision

🔧Drill & tap size recommendations

🛡️Durable thick hard plastic

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Description

🔩 Nail every project with precision and confidence!

BUILT TO LAST - Constructed from thick, hard plastic that resists oil, grease, and wear for dependable longevity.
TRUSTED BY PROS - Top-rated with 4.6 stars from over 2,800 users—join the community that demands accuracy and quality.
SMART SIZE GUIDANCE - Instantly recommends the perfect drill bit or tap size, eliminating guesswork and saving time.
EFFORTLESS MAINTENANCE - Smooth, easy-to-clean surface keeps your gauge looking sharp and ready for any job.
PRECISION AT YOUR FINGERTIPS - Quickly identify screw sizes with dual Metric and SAE scales for flawless project execution.

The BCP675 Screw Thread Gauge is a professional-grade tool designed to quickly and accurately measure screw sizes in both Metric and SAE standards. It also recommends the appropriate drill bit or tap size, streamlining your workflow. Made from durable thick plastic with a smooth, oil-resistant surface, this gauge is built for longevity and ease of use. Highly rated by thousands of users, it’s a must-have for any serious toolkit.

Specifications

ASIN	B07K7W3NQQ
Best Sellers Rank	#15,700 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #18 in Thread Gauges
Brand	BCP Fasteners
Compatible Groove Diameter	0.75 Inches
Customer Reviews	4.6 4.6 out of 5 stars (2,850)
Drive System	External Hex
Exterior Finish	Plastic
Fastener Size	No. 0
Fastener Type	Machine Screw
Finish Types	Uncoated
Global Trade Identification Number	00688938509163
Head Type	Flat
Item Diameter	1.6 Millimeters
Item Weight	9.07 g
Manufacturer	BCP Fasteners
Material Type	Plastic
Metal Type	Plastic
Model	BCP675
Number Of Items	1
Number of Pieces	1
Part Number	BCP675
Screw Head Style	Round
Screw Point Style	Fein
Set Screw Thread Type	Metric
Size Name	1.6mm to 16mm
Thread Class	coarse fine
Thread Coverage	Partially Threaded
Thread Size	0-80
Thread Style	Right Hand, Coarse
Thread Type	Unc, Unf
UPC	688938509163
Unit Count	1.0 Count

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