What does it mean for soft metal? Something like aluminum or mild steel? How about very hard and dense wood?

Correct, would be fine on all woods aswell

anyone know of a good American made set?

well I am just finishing a job where we have put in close to a thousand holes and still haven't worn this set out...you want American made be prepare to spend some dollars

china. but of excellent quality

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Neiko 10052A Spot Weld Drill Bits, High Speed Cobalt Steel with Titanium Coating | 8mm (5/16-Inch)

Product ID: 6060038

Details

Brand
NEIKO
Cutting Diameter
8 Millimeters
Finish Type
Titanium
Material
Cobalt
Shank Type
Straight

💪High-speed cobalt steel durability

🔥Titanium heat-resistant coating

⚙️8mm precision diameter

NZ$108

Duties & taxes included

In stock

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Description

🔥 Drill Like a Pro, Last Like a Legend ⚙️

BUILT TO LAST - Special cobalt steel blend designed for heavy-duty, long-lasting use.
VERSATILE COMPATIBILITY - Standard 8mm size fits most welding drills, perfect for automotive and metalwork pros.
UNMATCHED HEAT RESISTANCE - Titanium coating keeps performance sharp even under extreme temperatures.
SECURE GRIP PRO PERFORMANCE - Flat ground shaft guarantees a rock-solid chuck hold for professional-grade stability.
PRECISION SPOT WELD SEPARATION - Nibbed pilot tip ensures slip-free, exact drilling every time.

The Neiko 10052A Spot Weld Drill Bit combines high-speed cobalt steel with a titanium coating to deliver exceptional durability and heat resistance. Its 8mm diameter and nibbed pilot tip provide precise, slip-free spot weld separation, while the flat ground shaft ensures a secure grip in any welding drill. Engineered for professional use, this bit excels in automotive and metal fabrication tasks, promising long service life and consistent performance under demanding conditions.

Specifications

ASIN	B005TY5EPI
Best Sellers Rank	#40,286 in Automotive ( See Top 100 in Automotive ) #13 in Spot Welding Equipment
Brand Name	NEIKO
Customer Reviews	4.5 4.5 out of 5 stars (9,359)
Cutting Diameter	8 Millimeters
Finish Types	Titanium
Global Trade Identification Number	00837013100522
Included Components	1 spot weld drill bit
Item Dimensions	0.39 x 2.01 x 0.39 inches
Item Weight	9.07 g
Manufacturer	Ridgerock Tools Inc.
Material Type	Cobalt
Minimum Bore Diameter	8 Millimeters
Model	10052A
Number of Flutes	2
Point Style	Center Point
Shank Type	Straight
Surface Recommendation	Wood
Tool Flute Type	Spiral
UPC	837013100522
Unit Count	1.0 Count

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