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

🔥Titanium heat-resistant coating

⏱️Long-lasting cobalt steel durability

⚙️8mm precision diameter

R$184

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Drill Like a Pro, Last Like a Legend!

BUILT TO LAST - High-speed cobalt steel blend delivers extended bit life for heavy-duty use.
PRO GRADE PERFORMANCE - Engineered for automotive pros who demand flawless spot weld removal without metal distortion.
UNMATCHED HEAT RESISTANCE - Titanium coating keeps performance peak even under extreme temperatures.
SECURE GRIP ZERO SLIPPAGE - Flat ground shaft design guarantees a rock-solid chuck hold during high-speed drilling.
PRECISION SPOT WELD SEPARATION - 8mm nibbed pilot tip ensures exact, slip-free drilling every time.

The Neiko 10052A Spot Weld Drill Bit is an 8mm high-speed cobalt steel tool with a titanium coating, designed for precise, durable, and heat-resistant spot weld removal. Its flat shaft ensures secure chuck grip, while the nibbed pilot tip prevents slipping, making it ideal for automotive frame work and professional welding applications.

Specifications

ASIN	B005TY5EPI
Best Sellers Rank	#80,979 in Automotive ( See Top 100 in Automotive ) #36 in Spot Welding Equipment
Brand Name	NEIKO
Customer Reviews	4.3 4.3 out of 5 stars (497)
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
Number of Packs	1
Number of Pieces	1
Part Number	10052A
Point Style	Center Point
Set Name	Single
Shank Type	Straight
Surface Recommendation	Wood
Tool Flute Type	Spiral
UPC	837013100522
Unit Count	1 Count

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