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)

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 size range

🔩Tungsten carbide toughness

⚙️50 precision drill bits

9.23 OMR

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Description

🔧 Drill like a pro, finish like a boss!

VERSATILE MASTERY - Perfect for PCB, CNC engraving, jewelry, 3D printer nozzle cleaning & more
UNMATCHED DURABILITY - Crafted from tungsten steel for superior wear resistance and bending strength
PRECISION IN EVERY SPIN - 50pcs multi-size set (0.3-1.2mm) for flawless drilling across materials
CLEAN CUTS NO COMPROMISE - Sharp spiral flutes ensure smooth, glitch-free holes every time
READY TO GO BUILT TO LAST - Compact, protective case keeps your bits safe and organized on the move

The WayinTop 50pcs PCB Drill Bits Set features high-quality tungsten carbide bits ranging from 0.3mm to 1.2mm in diameter, designed for precision drilling on circuit boards, stone, metal, and more. With sharp spiral flutes and exceptional wear resistance, this set delivers clean, efficient cuts and comes in a durable, portable case—ideal for professionals demanding accuracy and longevity in their tools.

Specifications

ASIN	B07S636JHY
Best Sellers Rank	#23,770 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Circuit Board Drill Bits #487 in Drill Bits
Brand Name	WayinTop
Customer Reviews	4.4 4.4 out of 5 stars (1,814)
Cutting Diameter	1.2 millimeters
Finish Types	Steel
Item Dimensions	3.94 x 1.97 x 0.2 inches
Item Weight	185 g
Manufacturer	WayinTop
Material Type	Tungsten Steel
Minimum Bore Diameter	0.3 millimeters
Model	WYTP21
Number of Flutes	2
Number of Packs	10
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 Count

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9.23 OMR

Duties & taxes included

In stock

Sold byAmazon OMANDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to OMAN.

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Join PRO →

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TrustScore 4.5 | 7,300+ reviews

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