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

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

Product ID: 513302539

Details

Exterior finish
Plastic
Head style
Hex
Material
Plastic
Point style
Fein
Thread size
1 6 mm bis 16

📏Measures #0 to 3/4" & 1.6mm to 16mm

🔧Recommends drill & tap sizes

🛡️Durable thick hard plastic

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Description

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

POCKET SIZED POWER TOOL - Lightweight and compact enough to fit in your shirt pocket or tool chest—always ready when you are.
SMART DRILL TAP GUIDANCE - Never guess again—get exact drill bit and tap size recommendations tailored to your fastener.
PRECISION AT YOUR FINGERTIPS - Instantly identify screw sizes in both Metric & SAE standards for flawless projects.
TRUSTED BY PROS HOBBYISTS ALIKE - Join thousands of users who rely on this essential gauge for quick, accurate measurements every time.
BUILT TO LAST DESIGNED TO PERFORM - Crafted from rugged, thick plastic that resists oil, grease, and wear for long-term reliability.

The BCP Fasteners Screw Thread Gauge (BCP675) is a compact, durable tool designed to quickly and accurately measure screw sizes in both Metric and SAE standards. It also recommends the appropriate drill bit and tap sizes, making it an indispensable accessory for professionals and DIY enthusiasts. Made from thick, oil-resistant plastic, this lightweight gauge fits easily in your pocket or toolbox, ensuring fast, reliable measurements wherever you work.

Specifications

ASIN	B07K7W3NQQ
Best Sellers Rank	#129,813 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #34 in Thread Gauges
Brand	BCP Fasteners
Color	Black
Compatible Groove Diameter	0.08 Inches
Customer Reviews	4.6 4.6 out of 5 stars (2,700)
Drive System	Hex
Exterior Finish	Plastic
Fastener Size	1/4" x 3/4" to 1/2" x 1" (UNC) and 6mm x 19mm to 12mm x 30mm (Metric)
Fastener Type	Sheet Metal Screws
Finish Types	Plastic Coated
Global Trade Identification Number	00688938509163
Head Type	Rundkopf
Included Components	Tool Organizers, Tool Trays
Item Diameter	1.6 Millimeters
Item Type Name	ehf not applicable
Item Weight	0.02 Pounds
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	Hex
Screw Point Style	Fein
Set Name	Machine Screws and Screws
Set Screw Thread Type	Unified National Coarse (UNC)
Size Name	1.6mm to 16mm
Thread Class	1A
Thread Coverage	Fully Threaded
Thread Size	1,6 mm bis 16 mm metrisch
Thread Style	Right Hand, Coarse
Thread Type	UNC
UPC	688938509163
Unit Count	1 Count

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