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

🔩 Measure Like a Pro, Work Like a Boss!

BUILT TO LAST - Crafted from thick, hard plastic that resists oil, grease, and wear for long-term reliability.
POCKET READY PORTABILITY - Lightweight and compact design fits effortlessly in your shirt pocket or tool chest drawer.
SMART SIZE RECOMMENDATIONS - Never guess again—get the exact drill bit or tap size needed for your fastener.
PRECISION AT YOUR FINGERTIPS - Instantly identify screw sizes with dual metric and SAE scales for flawless fit every time.
PROFESSIONAL GRADE ESSENTIAL - Trusted by mechanics and hobbyists alike for fast, accurate thread measurement on the go.

The BCP675 Screw Thread Gauge is a professional-grade, dual metric and SAE tool designed for quick, accurate screw size identification. It recommends compatible drill bit and tap sizes, is made from durable thick plastic with an easy-to-clean surface resistant to oil and grease, and covers thread sizes from #0 to 3/4" coarse and fine, making it an indispensable, portable tool for mechanics and DIY enthusiasts.

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	68 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
Model number	BCP675
Special Feature	lightweight
Specific Product Use	professional
Item model number	BCP675
Power Source	hand powered
Are batteries included?	No

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