What is the diameter of the shaft? Will it fit in a standard pin vise?

Diameter of the shaft is 1/8" or .125

Can I put these in a dremel tool?

Absolutely, but you have to remember these are extremely brittle. ANY side force will break the bit. You are best served using them in some sort of press but with very steady hands and a thoughtful method, operating by hand is possible.

can these be use by hand twisting on brass jets in carburetors to enlarge the one increiment at a time?

I'm going to say yes. I twist them by hand, but I should also mention that I'm drilling into wood. I build model ships. Drilling into brass might be possible, but be aware that these bits, although very effective drilling into wood, are very brittle. I can't tell you how many have snapped on me when I least suspect it and I have to break out another set. I've learned to drill carefully and with patience. Other than that, I do like these bits and have started using them in my Dremel.

Are these recommended for drilling into raw semi-precious stones (like Crystal Quartz, amethyst, agate etc) for the purpose of creating pendant holes?

No. You really need a diamond bit or hole saw, depending on the size. You'll also want to have a water drip going or at least use some sort of lubricant such as beeswax or gem lube.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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50pcs PCB Drill Bits Set Spiral Flute Carbide 0.3mm-1.2mm for Print Circuit Board Stone Dremel Jewelry CNC Engraving (5PCS Each)

Product ID: 136244978

Details

Brand
WayinTop
Cutting Diameter
1.2
Finish Type
Steel
Material
Tungsten Steel
Shank Type
Straight

🎯0.3mm-1.2mm ultra-fine drilling range

💎Tungsten steel, ultra-hard & wear-resistant

⚙️50 precision bits, 10 sizes

A$31

Duties & taxes included

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Sold byAmazon AustraliaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Drill Like a Pro, Finish Like a Boss

BUILT TO OUTLAST - Crafted from premium tungsten steel for unmatched hardness and wear resistance—work smarter, not harder.
PRECISION IN EVERY SPIN - 10 sizes from 0.3mm to 1.2mm, 5 pieces each for flawless, repeatable drilling.
CLEAN CUTS NO COMPROMISE - Sharp spiral flutes ensure smooth, chip-free drilling on PCBs, stone, metal, and more.
VERSATILITY MEETS EFFICIENCY - Perfect for PCB manufacturing, CNC engraving, jewelry making, and 3D printer nozzle cleaning.
READY TO GO READY TO PROTECT - Comes in a durable, portable case that safeguards your bits and keeps your workflow seamless.

The WayinTop 50pcs PCB Drill Bits Set features 10 sizes ranging from 0.3mm to 1.2mm, each with 5 high-precision tungsten steel bits. Designed for durability and clean, efficient drilling on circuit boards, stone, metal, and more, this set is housed in a protective case for easy transport and storage—ideal for professionals demanding precision and longevity.

Specifications

ASIN	B07S636JHY
Best Sellers Rank	#21,665 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Circuit Board Drill Bits #442 in Drill Bits
Brand Name	WayinTop
Customer Reviews	4.4 4.4 out of 5 stars (1,801)
Cutting Diameter	1.2 Millimeters
Finish Types	Steel
Item Dimensions	3.94 x 1.97 x 0.2 inches
Item Weight	185 Grams
Manufacturer	WayinTop
Material Type	Tungsten Steel
Minimum Bore Diameter	0.3 Millimeters
Model	WYTP21
Number of Flutes	3
Number of Pieces	50
Part Number	WYTP21
Point Style	Spear Point
Set Name	PCB Drill Bits Set
Shank Type	Straight
Surface Recommendation	Steel,Stone
Tool Flute Type	Spiral
UPC	713871273991 713871270419
Unit Count	50.0 Count

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