Is the metal plated for corrosion resistance? What kind of plating?

It definately has some sort of corrosion protection. Not quite sure if it's a light zinc or what hut thry are not corroding at my house and I live on the water.

will these casters fit the origami 6 tier bookshelf?

I’m not familiar with the origami 6 tier book shelf. Are there holes in the bottom to accommodate the threaded studs? They are very nice wheels!

Can the 1 1/2 inch screw be replaced by a longer screw?

The 1 1/2'' screw is a stud that is form to the bracket of the caster.. Hope this helps.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Caster Wheels 3 inch Locking Stem Casters, 3/8" -16 x 1-1/2" (Stem Diameter 3/8", Stem Length 1-1/2") Threaded Stem Casters Swivel Casters Set of 4 Heavy Duty Castors Gray

Caster Wheels 3 inch Locking Stem Casters, 3/8" -16 x 1-1/2" (Stem Diameter 3/8", Stem Length 1-1/2") Threaded Stem Casters Swivel Casters Set of 4 Heavy Duty Castors Gray

Product ID: 529116560

Details

Brand
HOLKIE
Colour
Gray
Item Weight
1.3 Kilograms
Material
Steel
Wheel Diameter
3 Inches

🔄360° swivel for agile mobility

🔒Side locking brake for safety

⚙️600 lbs max load capacity

Description

🔧 Roll with confidence, lock with ease—mobility that means business.

LOCK IT DOWN - Integrated side locking brake ensures your equipment stays exactly where you want it—no slips, no accidents.
360 AGILE SWIVEL - Full swivel head lets you pivot on a dime—perfect for dynamic workspaces and tight corners.
HEAVY DUTY STRENGTH - Engineered steel housing supports up to 600 lbs—built to last under pressure.
SMOOTH SILENT GLIDE - Non-marring thermoplastic rubber wheels absorb shock and roll quietly across any surface.
VERSATILE MOBILITY UPGRADE - Ideal for workbenches, art tables, instrument cases, and more—turn any stationary setup into a mobile powerhouse.

This set of four 3-inch locking stem casters from HOLKIE combines heavy-duty steel construction with a 600 lbs load capacity and 360° swivel action. Featuring non-marring, shock-absorbing thermoplastic rubber wheels and a reliable side locking brake, these casters deliver smooth, quiet, and secure mobility for a variety of professional and industrial applications.

Specifications

ASIN	B09GFDSRMD
Best Sellers Rank	#1,707,713 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #2,048 in Casters
Brand Name	HOLKIE
Caster Type	Stem
Colour	Gray
Country of Origin	USA
Customer Reviews	4.6 4.6 out of 5 stars (3,950)
Included Components	Stem casters×4; Screws×4; Wrench×1
Item Weight	1.3 Kilograms
Load Capacity	6E+2 Pounds
Manufacturer	HOLKIE
Material Type	Steel
Model Number	SGJL3G38
Mounting Type	Stem Mount
Part Number	SGJL3G38
Surface Recommendation	Multi-Surface
UPC	795276999652
Wheel Diameter	3 Inches
Wheel Width	2 Inches

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