Check the listing for details. 4 Heavy Duty Caster Wheels Set 4" 5" 6" 8" Poly on Cast Iron Wheels Set. Condition: New. Listed at 43.91 USD. Options - 4" Bearing ( 4 of 4" Wheels with Bearing ) - 4" B & Bushing ( 4 of 4" Wheels with Bearing & Bushings ) - 4" B & B & Axle ( 4 of 4" Wheels with Bearing & Bushings & Axle Bolts & Nuts ) - 5" Bearing ( 4 of 5" Wheels with Bearing )- 5" B & Bushing ( 4 of 5" Wheels with Bearing & Bushings ) - 5" B & B & Axle ( 4 of 5" Wheels with Bearing & Bushings & Axle Bolts & Nuts ) - 6" Bearing ( 4 of 6" Wheels with Bearing )- 6" B & Bushing ( 4 of 6" Wheels with Bearing & Bushings ) - 6" B & B & Axle ( 4 of 6" Wheels with Bearing & Bushings & Axle Bolts & Nuts ) - 8" Bearing ( 4 of 8" Wheels with Bearing )- 8" B & Bushing ( 4 of 8" Wheels with Bearing & Bushings ) - 8" B & B & Axle ( 4 of 8" Wheels with Bearing & Bushings & Axle Bolts & Nuts ) Description 1. Rubber on Cast Iron Wheel 2. Wheel Diameter : 4" / 5" / 6" / 8" 3. Tread Width : 2" 4. Load Capacity : (4" : 350 lbs/ea) / (5" : 400 lbs/ea) / (6" : 450 lbs/ea) / (8" : 500 lbs/ea) 5. Bearing : O.D 1-3/16" / I.D 3/4" / Length 1-7/8" 6. Bushing : O.D 3/4" / I.D 1/2" / Length 2-7/16" 7. Axle & Nut : Dia. 1/2" / Type Zerk / Length 3-3/8"