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 style!

RUGGED RELIABLE - Constructed from thick, hard plastic to withstand daily wear and tear without losing accuracy.
COMPACT VERSATILE - Fits seamlessly into any toolkit, empowering you to tackle a wide range of fastening tasks with confidence.
SMART SIZE GUIDANCE - Built-in drill bit and tap size recommendations eliminate guesswork and speed up your workflow.
CLEAN PROFESSIONAL - Smooth, oil- and grease-resistant surface ensures easy maintenance and a sleek look on your workbench.
PRECISION AT YOUR FINGERTIPS - Instantly identify screw sizes in both Metric and SAE standards for flawless projects.

The BCP675 Screw Thread Gauge offers quick, accurate screw size identification in both Metric and SAE standards, while recommending the ideal drill bit and tap sizes. Made from durable thick plastic with a smooth, easy-to-clean surface, this compact tool is designed for professionals seeking reliable, long-lasting performance in their fastening tasks.

Specifications

ASIN	B07K7W3NQQ
Best Sellers Rank	#15,215 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #19 in Thread Gauges
Brand	BCP Fasteners
Compatible Groove Diameter	0.75 Inches
Customer Reviews	4.6 out of 5 stars 2,854 Reviews
Drive System	External Hex
Exterior Finish	Plastic
Fastener Size	No. 0
Fastener Type	Machine Screw
Finish Types	Uncoated
Global Trade Identification Number	00688938509163
Head Style	Round
Head Type	Flat
Item Diameter	1.6 Millimeters
Item Weight	0.02 Pounds
Manufacturer	BCP Fasteners
Material	Plastic
Material Type	Plastic
Metal Type	Plastic
Model	BCP675
Number Of Items	1
Number of Pieces	1
Part Number	BCP675
Point Style	Fein
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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