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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⚡ Drill with precision, power, and unstoppable heat resistance!

BUILT TO LAST - Special cobalt steel blend resists wear and tear under high-speed, heavy-duty use.
PRECISION PERFECTED - Pilot tip with nib ensures slip-free, accurate spot weld drilling every time.
HEAT DEFYING COATING - Titanium finish withstands extreme temperatures for consistent performance.
SECURE GRIP ZERO SLIP - Flat ground shaft locks firmly in your drill chuck for maximum control.
PRO GRADE COMPATIBILITY - Standard 8mm size fits most welded drills, ideal for automotive frame work.

The Neiko 10052A Spot Welding Drill Bit is an 8mm high-speed cobalt steel tool coated with heat-resistant titanium, designed for precise, durable spot weld separation. Its pilot tip prevents slipping, while the flat shaft ensures a secure drill chuck grip, making it a pro-grade choice for automotive and metalwork professionals.

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Manufacturer	Ridgerock Tools Inc.
Part number	10052A
Item Weight	9.07 g
Product Dimensions	0.99 x 5.11 x 0.99 cm; 9.07 g
Size	8 mm/5/16"
Style	Spot welding
Finish	Titanium
Material	Cobalt
Installation Method	Spot welding
Number Of Pieces	1
Measurement System	in
Included Components	1 x Spot Welding Drill Bit
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	10 x 51 x 10 mm

Neiko 10052A Spot Welding Drill Bit High Speed Cobalt Steel Titanium Coating | 8mm (5/16")

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