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 power – don’t get left behind!

VERSATILE MASTERY - From carving to polishing, this set handles 15+ materials and tasks with ease and control.
COMPACT ORGANIZED - Includes a sleek wood base and clear clamshell box for stylish storage and quick access.
DOUBLE CUT TECHNOLOGY - Finer finish with reduced chip size for cleaner, smoother results every time.
UNIVERSAL COMPATIBILITY - 1/4" shank fits all major die grinders like DeWALT, Milwaukee, Makita—no tool left behind.
PRECISION ENGINEERED FOR PROFESSIONALS - 10 ultra-sharp tungsten carbide burrs designed for flawless metal, wood, stone, and plastic work.

The Sworker Carbide Burr Set features 10 durable tungsten carbide bits with a 1/4" shank, compatible with leading die grinders. Engineered for high-speed (up to 60,000 RPM) and double-cut for superior finish quality, this versatile set excels in carving, grinding, polishing, and more across metal, wood, stone, and plastic. Packaged with a wood base and clear box, it offers professional-grade performance and organized convenience.

Specifications

Manufacturer	Sworker
Part number	CBS-5
Item Weight	231 g
Product Dimensions	10.21 x 7.95 x 1.45 cm; 231 g
Item model number	CBS-5
Size	XL
Color	silver grey
Style	10 Piece Tungsten Carbide Router Bit Set 1/4" Shank
Finish	Uncoated/Lightly Lubricated
Material	Tungsten Carbide
Pattern	Double grinding
Shape	Ball, Cylinder, Ball-nosed-cylinder, Ball-nosed-cone, Ball-nosed-tree, Flame, Oval.
Installation Method	1/4" (6.35mm) Collect
Item Package Quantity	1
Number Of Pieces	10
Speed	60000 RPM
Tool Tip Description	Cylindrical Shank
Measurement System	Imperial
Accessory Connection Type	1/4" Collect and Nut of Rotary Tool
Plug Profile	1/4" Collect and Nut of Rotary Tools
Specific uses	Metal wood stone steel plastic carving grinding cutting grinding engraving deburring porting polishing
Included components	10pcs 1/4 inch router bits, 1 slotted plastic folding box, 1 manual and 1 paper box.
Batteries Included?	No
Batteries Required?	No

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