Is one of the bits good for making a Flat bottom ?

Yes, the cylindrical shapes burrs in the kit can make a flat bottom.

Can these 1/4 inch shank burrs be inserted into the 1/4 inch collect of Milwaukee M12 easily?

Our 1/4 inch shank burrs can be inserted into rotary tool's 1/4 inch collect easily, Such as Milwaukee,Ingersoll Rand,DEWALT,Makita,etc.

does it provide any clear info what each bit is for? i wouldn't know which is for wood, plastic, metal, etc.

There are no instructions at all. I am a retired tool & die maker. I use them for working on metal. These will work on any kind of metal including hardened steel. You don't need carbide for wood or plastics but these will work on them. You will need to clean them frequently. I don't recommend using these for gems as one person enquired about. Gems are harder than hardened steel and most are harder than carbide tools.

Does this work on stainless steel and mild steel?

My set worked great on mild steel and should work as well on stainless steel.

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Description

⚡ Elevate your craft with precision that outpaces the rest!

BUILT TO LAST - Durable carbide material resists wear and shaft bending even at max speeds.
COMPACT ORGANIZED - Comes in a sleek cassette-style case for easy storage and on-the-go creativity.
UNMATCHED SMOOTHNESS - Double-cut design minimizes chips and slivers for a flawless finish every time.
PRECISION IN EVERY CUT - 20 versatile burr shapes to master wood, metal, and stone detailing with ease.
SEAMLESS COMPATIBILITY - Fits all major rotary tools including Dremel, Bosch, DeWALT, and more for instant upgrade.

The Sworker Carbide Burr Set offers 20 double-cut, carbide burrs designed for high-speed rotary tools up to 140,000 RPM. Compatible with leading brands like Dremel and Bosch, this set delivers superior control and a fine finish on wood, metal, and stone. Its durable construction ensures long-lasting performance without shaft bending, making it an essential upgrade for professional-grade carving, grinding, and engraving.

Specifications

Manufacturer	Sworker
Part number	69265213
Item Weight	100 g
Product Dimensions	9.86 x 6.76 x 1.19 cm; 100 g
Item model number	CBS-4
Size	1/8Shank
Color	Bright
Style	20PCS,L+S Head
Finish	Uncoated
Material	Carbide
Pattern	Double-cut
Shape	Cylindrical, Ball Cylindrical, Ball, Oval, Ball Tree, Tree, Flame, Ball Cone, Cone, Inverted Cone
Power source type	Best in Rotary Collet Tools (High Rpm). Poor in Low-rpm Drills/Drill Presses.
Installation Method	3mm or 1/8"(3.175mm)Collet nut or 3-jaw chuck
Item Package Quantity	1
Number Of Pieces	20
Speed	140000 RPM
Measurement System	US
Special Features	Easy to Install
Specific uses	Grinding, deburring, cutting, shaping, porting on metal, steel, aluminum, wood, stone. Works with die grinders and rotary tools. Ideal for metalworking, fabrication, carving, and tool maintenance.
Included components	20 burrs, 1 slotted plastic box like cassette tape holder, 1 manual, 1 paper box
Batteries Included?	No
Batteries Required?	No

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