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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Description

🛠️ Nail every measurement, every time — don’t get left behind!

BUILT TO LAST - Crafted from thick, durable plastic that resists oil, grease, and wear for long-term reliability.
PRO GRADE EFFICIENCY - Instant drill bit and tap size recommendations save time and eliminate guesswork.
POCKET READY PORTABILITY - Lightweight and compact design fits effortlessly in your shirt pocket or tool chest.
DUAL STANDARD COMPATIBILITY - Seamlessly switch between Metric and SAE measurements for versatile use.
PRECISION AT YOUR FINGERTIPS - Quickly identify screw sizes with unmatched accuracy to keep your projects moving.

The BCP675 Screw Thread Gauge is a professional-grade, lightweight plastic tool designed to quickly and accurately measure screw sizes from #0 to 3/4" in both coarse and fine threads. It supports both Metric (1.6mm to 16mm) and SAE standards, while recommending the correct drill bit or tap size for each screw. Durable, oil-resistant, and pocket-friendly, it’s an essential tool for mechanics and hobbyists aiming for precision and efficiency.

Specifications

Material	Plastic
Head Style	Round
Exterior Finish	Plastic
Thread Size	0-80
Point Style	Fein
Metal Type	plastic
Brand	BCP Fasteners
Colour	Black
Head Type	Flat
Item Weight	9 g
Thread Type	coarse fine
Thread Coverage	Fully Threaded
Fastener Type	Machine Screw
Set Screw Thread Type	UNC, UNF
Thread Style	coarse fine
Thread Class	fine
Fastener Size	No. 0
Size	No. 0
Item Diameter	1.6 Millimetres
Compatible groove diameter	1.6 Millimeters
Number of Pieces	1
Manufacturer	BCP Fasteners
Country of Origin	USA
Model number	BCP675
Special Feature	lightweight
Specific Product Use	professional
Item Weight	9.07 g
Item model number	BCP675
Power Source	hand powered
Are batteries included?	No

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