What is the outside diameter of the 21mm socket? With and without the protecting sleeve if possible...

I am not sure on the actual size. However it is the same diameter as a tradition socket. It will but ohm type rims but if you have aftermarket you may have issues.

Are these Chrome Moly, Chrome Vanadium, or something else?

per the Gear Wrench Website "GEARWRENCH offers a wide range of impact sockets in open stock and sets that are designed to deliver the performance and strength that the professional users require. They are made from chrome molybdenum alloy steel for exceptional strength and durability. Sockets have a manganese phosphate coating to resist corrosion. The sockets also feature highly visible laser etched markings and a secondary size hard stamping. The sockets feature off-corner loading to reduce fastener rounding. FEATURES High-strength impact socket for up to 3x longer life than regular thin wall impact sockets Thin wall socket design for access in confined spaces Protective outer sheath prevents damage to wheels"

Do these sockets have any coating to protect against corrosion?

They have the usual kosmoline film however once you use them and clean then you best use them. The coat is for storage before purchase. Ifor you will use them rarely keep away from moist places.

Do these sockets protect the lug nuts from getting scratched?

Only the tops. Also the area around the lug nut if it's close clearance around the nut by the wheel itself.

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GEARWRENCH 3 Piece 1/2" Drive Wheel Protector Impact Socket Set | 84946

GEARWRENCH 3 Piece 1/2" Drive Wheel Protector Impact Socket Set | 84946

Product ID: 12173250

Details

Brand
GEARWRENCH
Drive System
Nutsetter
Finish Type
Manganese
Material
Alloy Steel
Number of Pieces
3

🔧Thin wall design for tight spaces

⚙️3x longer life impact sockets

🛡️Protective outer sheath for wheels

SAR 238

Duties & taxes included

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Description

🛠️ Protect your wheels, power your projects — the pro’s choice impact socket set!

BUILT TO LAST 3 X LONGER - High-strength impact sockets engineered for durability that outperforms standard thin wall sets.
CORROSION RESISTANT FINISH - Manganese phosphate coating ensures your sockets stay rust-free and reliable over time.
TRUSTED BY PROS SINCE 1996 - From the original patented ratcheting wrench innovators, GearWrench delivers professional-grade performance.
ULTIMATE WHEEL NUT PROTECTION - Protective outer sheath and insert safeguard your wheels and lug nuts from scratches and damage.
PRECISION FIT IN CONFINED SPACES - Thin wall socket design lets you access lug nuts in the tightest wheel wells with ease.

The GEARWRENCH 3 Piece 1/2" Drive Wheel Protector Impact Socket Set (sizes 17mm, 19mm, 21mm) features high-strength alloy steel sockets with a manganese phosphate finish for corrosion resistance. Designed with a thin wall profile and protective outer sheath, it offers superior access and safeguards wheels and lug nuts from damage. Trusted by automotive pros since 1996, this set delivers up to 3x longer life than regular impact sockets.

Specifications

ASIN	B00CT9LQSK
Best Sellers Rank	#84,164 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #260 in Socket Wrenches
Bit Set Composition	Bit Set
Brand Name	GEARWRENCH
Customer Reviews	4.7 4.7 out of 5 stars (970)
Drive Bit Application	automotive
Drive Bit Shank Style	1/2" Drive
Drive System	Nutsetter
Finish Types	Manganese Phosphate
Global Trade Identification Number	00099575849466
Included Components	3 Pc. 1/2" Drive High-Strength Wheel Protector Impact Socket Set
Item Type Name	Socket Set
Item Weight	12.64 ounces
Manufacturer	GEARWRENCH
Manufacturer Part Number	84946
Manufacturer Warranty Description	Manufacturer Warranty
Material Type	Alloy Steel
Model Number	84946
Number of Items	1
Number of Pieces	3
Set Name	High-Strength Wheel Protector Impact Metric Socket Set
UPC	099575849466
Unit Count	1 Count

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