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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🛠️ Nail every project with precision — don’t get caught guessing!

BUILT TO LAST - Crafted from thick, durable plastic that resists oil and grease—your reliable workshop companion.
POCKET SIZED POWER - Lightweight and compact, fits perfectly in your shirt pocket or tool drawer for on-the-go accuracy.
SMART RECOMMENDATIONS - Automatically suggests the ideal drill bit or tap size, saving you time and costly mistakes.
DUAL SYSTEM COMPATIBILITY - Seamlessly switch between Metric (1.6mm-16mm) and SAE standards to cover every fastener need.
PRECISION AT YOUR FINGERTIPS - Instantly identify screw sizes from #0 to 3/4" coarse and fine threads for flawless projects.

The BCP Fasteners Screw Thread Gauge (BCP675) is a durable, pocket-sized tool designed for professionals and hobbyists alike. It accurately measures screw sizes from #0 to 3/4" in both Metric and SAE standards, while recommending the correct drill bit or tap size. Made from thick, oil-resistant plastic, it ensures long-lasting performance and easy maintenance.

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Manufacturer	BCP Fasteners
Part number	BCP675
Item Weight	68 g
Item model number	BCP675
Size	1.6mm to 16mm
Color	Black
Material	Plastic
Shape	rectangular
Item Package Quantity	1
Number Of Pieces	1
Head Style	Hex
Cutting Diameter	16 Millimeters
Measurement System	Metric
Included components	Tool Organizers, Tool Trays
Batteries Included?	No
Batteries Required?	No
Item diameter	16 Millimeters

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

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