Casters are either rigid (roll forward or backward, but do not rotate) or swivel (roll & rotate). 
Four swivel casters provides the most mobility, as a cart can instantly change direction 90 degrees, but it is harder to push a four- swiveled cart in one direction (as there is no directional stability), a disadvantage that becomes noticeable in about 10 feet of pushing. 
A good choice is two swiveling casters located at one end of a cart and two rigid casters at the opposite end. 
90 lbs rated. 
Wheel diameter 2"x15/16"
Mounting Height 2-5/8"
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