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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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: 564080750

Details

Brand
WayinTop
Finish type
White
Item dimensions L x W x H
10 x 5 x 0.5
Material
Tungsten Steel
Shank type
ビット

📏0.3mm-1.2mm multi-size range

🔩Tungsten steel carbide strength

⚙️50 precision drill bits

1601871₫

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Drill Like a Pro, Finish Like a Boss!

COMPLETE SIZE SPECTRUM - Ten sizes from 0.3mm to 1.2mm, each with 5 pieces, ensure you never run out of the perfect fit for any task.
PRECISION IN EVERY SPIN - Sharp cutting edges and spiral flutes deliver flawless, clean holes with zero scrap—engineered for perfection.
TRAVEL READY DAMAGE PROOF - Packaged in durable white plastic cases for easy transport and ultimate protection—carry your toolkit with confidence.
BUILT TO LAST BUILT FOR SPEED - Crafted from high-hardness tungsten steel, these bits resist wear and bending for long-lasting, efficient drilling.
VERSATILITY MEETS PROFESSIONALISM - From PCB boards to jewelry and CNC engraving, this set adapts seamlessly to your diverse precision projects.

This 50-piece PCB drill bit set features tungsten steel carbide bits ranging from 0.3mm to 1.2mm in diameter, designed for high precision and durability. Ideal for circuit boards, CNC engraving, jewelry, and more, each bit boasts sharp cutting edges and spiral flutes for clean, efficient drilling. Packaged in protective white plastic cases, this set combines versatility, longevity, and portability for professional-grade results.

Specifications

ASIN	B07S636JHY
ASIN	B07S636JHY
Best Sellers Rank	#177,874 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #720 in Power Drill Bit Sets
Brand Name	WayinTop
Customer Reviews	4.4 4.4 out of 5 stars (1,732)
Customer reviews	4.4 4.4 out of 5 stars (1,732)
Date First Available	20 June 2019
Finish Types	White
Item Dimensions	10 x 5 x 0.5 centimeters
Item Weight	185 Grams
Item model number	WYTP21
Manufacturer	WayinTop
Manufacturer	WayinTop
Material Type	Tungsten Steel
Minimum Bore Diameter	0.3 Millimeters
Model	WYTP21
Number of Flutes	3
Number of Packs	10
Number of Pieces	50
Part Number	WYTP21
Point Style	Spear Point
Product Dimensions	10 x 5 x 0.5 cm; 185 g
Set Name	50pcs 0.3mm-1.2mm Carbide Spiral Helix PCB Drill Bit Set
Shank Type	ビット
Surface Recommendation	Metal
Tool Flute Type	Spiral
UPC	713871273991 713871270419
Unit Count	50.0 Count

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