Can I use this on stone like hard river rock?

So far I have only used it on glass and clay/ceramic. I would strongly advise if you do try it, use water to help with the friction. It says that you can use it on stone , gemstones, rocks, and pebbles. Hopefully that answers your question

what is the chuck size 3/8 or 1/2 , I have 3/8 inch chuck?

I have a dewalt drill with 3/8 in chuck its perfect.

What maximum thickness are these suitable for? What is the thickness of the diamond dust on the smallest three cutters?

I can't tell you in exact dimensions how thick the coating of the cutters are. I can tell you that I cut a hole through a substantial hi-power electrical insulator big enough to run a 120-v plug through. Before using these bits-nothing could touch the ceramics it was made of. The secret to success is to run water on the project while drilling.

What machine can i buy for the drill bits?

and drill will work, cordless or corded

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💎 Drill Like a Pro, Shine Like a Diamond!

PRECISION IN EVERY CUT - 15 versatile drill bit sizes from 0.23 to 2 inches to tackle any project with exactness.
DIAMOND TOUGH DURABILITY - Industrial-grade diamond coating ensures long-lasting sharpness and wear resistance.
COMPLETE KIT FOR PROFESSIONALS - A comprehensive 15-piece set designed to meet all your drilling needs in one sleek package.
EFFORTLESS MULTI MATERIAL DRILLING - Engineered to cleanly cut through ceramic, glass, marble, granite, and more without chipping.
EXTENDED TOOL LIFE WITH WATER LUBRICATION - Use with water to maximize bit longevity and maintain flawless performance.

The YLYLDiamond Drill Bits Set offers 15 precision diamond-coated bits ranging from 6mm to 50mm, engineered for clean, accurate holes in hard surfaces like ceramic, glass, marble, and granite. Crafted from industrial-grade carbon steel with a diamond finish, this durable kit ensures extended tool life when used with water lubrication, making it the ultimate choice for professionals and DIY enthusiasts seeking flawless results.

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Manufacturer	YLYL
Part number	YLYL011
Item Weight	308 g
Package Dimensions	12.8 x 7.49 x 6.2 cm; 308 g
Item model number	YLYL011
Size	0.23 Inch - 2 Inch（6mm - 50mm）
Color	silver
Style	Industrial
Finish	Diamond Coating
Material	Diamond,Glass,Marble
Item Package Quantity	1
Number Of Pieces	15
Batteries Included?	No
Batteries Required?	No

YLYL Diamond Drill Bits for Ceramic, Diamond Hole Saw Drill Bit Set Kit, Glass Drill Bit for Bottles, Pots, Marble, Granite Stone, Tile Cutting 0.23 Inch - 2 Inch (6 mm - 50 mm) Pack of 15

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