Wheel diameter: 4"
Tread width: 1-1/2"
Hub length: 1-5/8"
Bearing ID: 3/8" 
Bore: 3/8" precision
Durometer: 95 Shore D (±5) 
Temperature range: -40° F to +475° F continuously, 525° F intermittent
Wheel bearing: Precision
Load capacity: 700 lbs
Construction: Compression-molded high-temperature epoxy resin thermoset material
Easy-rolling integrated ball bearing locked in hub
High temp grease injected in bearing, no maintenance required
Superior high-temp performance, unmatched by phenolic or fiberglass