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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🔧 Drill Like a Pro, Finish Like a Boss!

BUILT TO LAST - Crafted from high-hardness tungsten steel, these bits resist wear and bending for long-term reliability.
ORGANIZED PORTABLE - Comes in durable white plastic cases designed to protect and easily carry your bits anywhere.
VERSATILE SIZE RANGE - Ten sizes from 0.3mm to 1.2mm, each with 5 pieces, cover all your PCB, jewelry, and CNC engraving needs.
MULTI MATERIAL MASTERY - Perfect for circuit boards, 3D printer nozzles, amber beeswax, plexiglass, and more—engineered for precision across materials.
PRECISION IN EVERY CUT - Sharp cutting edges and spiral flutes ensure flawless, glitch-free drilling for your most intricate projects.

The WayinTop 50pcs PCB Drill Bits Set features high-quality tungsten steel bits in ten precise sizes (0.3mm to 1.2mm), designed for professional-grade drilling on PCBs, jewelry, CNC engraving, and various materials. Each size includes 5 bits, housed in protective white plastic cases for durability and portability, ensuring clean, efficient, and reliable performance every time.

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Manufacturer	WayinTop
Part number	WYTP21
Item Weight	185 g
Product Dimensions	10 x 5 x 0.5 cm; 185 g
Item model number	WYTP21
Finish	White
Material	Tungsten Steel
Item Package Quantity	50
Number Of Pieces	50
Measurement System	Metric
Batteries Included?	No
Batteries Required?	No

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

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