One of the pictures seems to have a measurement of 8" from top of plate to bottom of wheel. Is that correct, or is the wheel diameter 8"?

The wheel itself is 8" in diameter, the top of the plate is at 9-1/2".

What is the wheel bearing size (diameter of the hole for the axle)?

The bolt measures 0.4011" OD (10 mm), and has a 19mm hex bolt head and nut. BUT the bolt has a SPACER SLEEVE over it, which fits all the way thru the bearings. That spacer measures 0.6515" OD (16.5 mm), which is a "snug" fit into the bearing holes. I did not mic inside of the bearing holes. So the bearing hole is a "tad" larger than the 0.6515" OD spacer.

It says a pack, not each so it’s confusing. How many castors are in an order?

1 wheel per order, we apologize for the confusing, we will update the listing

The tire is made of rubber or polyurethane? because I see it listed as rubber on other sites

Very hard and durable rubber, not poly. I have over 100 of these, most are 4 years old, for garden caddy carts for heavy plants, mostly out in the weather year round. You will want to paint the silver rivets on the hubs to prevent rust, and grease the alemite (zerk) fittings.

Item Weight	7.7 Pounds
Mounting Type	Surfaces
Load Capacity	250 Pounds
Caster Type	Swivel
Plate length	4.5 Inches
Plate width	3.7 Inches
Surface Recommendation	Multi-Surface
Wheel Width	2 Inches
Manufacturer	Houseables
Item Weight	7.74 pounds
Item model number	CWS-BK-08IN
Is Discontinued By Manufacturer	No
Manufacturer Part Number	CWS-BK-08IN
Special Features	Swivel
Rim Diameter	8 Inches

Houseables 8 Inch Caster Wheels, Swivel Wheels, Rubber Casters, Large, for Cart, Heavy Duty, Outdoor, Off Road, Offroad, All Terrain, Flat Free Tire, No Flat, Industrial, Castor, Dolly, Utility Cart

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