Wheels without forks
diameter	tread width	bore	hub length	weight each
Swivel castors
top plate size	bolt hole spacing	bolt hole	offset	total height
stem dimensions	base width	hole diameter	weight each
Swivel castors with brake
wheel brake		total lock
Fixed castors
top plate size	bolt hole spacing	bolt hole	total height	weight each
plain-bearing	roller-bearing	precision ball-bearing		load capacity

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