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)

Product ID: 405913277

Details

Exterior Finish
Plastic
Head Style
Round
Material
Plastic
Point Style
Fein
Thread Size
0-80

📏Measures #0 to 3/4" & 1.6mm to 16mm

⏱️Fast identification in seconds

🛠️Recommends drill & tap sizes

190 Lei

Duties & taxes included

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Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Nail every measurement with precision and speed!

COMPACT PORTABLE - Fits effortlessly in your pocket or tool drawer for on-the-go precision.
INSTANT FASTENER ID - Eliminate guesswork with rapid, precise screw size detection.
BUILT IN DRILL TAP GUIDE - Confidently select the perfect drill bit or tap size every time.
DURABLE OIL RESISTANT DESIGN - Crafted from tough plastic that resists grease and stands up to daily shop wear.
DUAL METRIC SAE COMPATIBILITY - Seamlessly measure both coarse and fine threads across imperial and metric standards.

The BCP675 Screw Thread Gauge is a professional-grade tool designed for quick and accurate screw size identification. Compatible with both metric (1.6mm to 16mm) and SAE (#0 to 3/4") threads, it also recommends the ideal drill bit and tap sizes. Built from durable, oil-resistant plastic, this compact gauge is perfect for mechanics and DIY enthusiasts seeking reliable, portable fastener measurement.

Specifications

ASIN	B07K7W3NQQ
Best Sellers Rank	#117,770 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #225 in Dimensional Measurement Gauges
Brand	BCP Fasteners
Colour	Black
Compatible Groove Diameter	1.6 Millimeters
Country Of Origin	USA
Customer Reviews	4.6 4.6 out of 5 stars (2,723)
Drive System	External Hex
Exterior Finish	Plastic
Fastener Size	No. 0
Fastener Type	Machine Screw
Finish Types	Uncoated
Global Trade Identification Number	00688938509163
Head Type	Flat
Item Diameter	1.6 Millimetres
Item Weight	0.02 Pounds
Manufacturer	BCP Fasteners
Material Type	Plastic
Metal Type	plastic
Model	BCP675
Number Of Items	1
Number of Packs	1
Number of Pieces	1
Part Number	BCP675
Screw Head Style	Round
Screw Point Style	Fein
Set Screw Thread Type	UNC, UNF
Size Name	No. 0
Thread Class	fine
Thread Coverage	Fully Threaded
Thread Size	0-80
Thread Style	coarse fine
Thread Type	coarse fine
UPC	688938509163
Unit Count	1.0 Count

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