How to match and use caster wheel

Different combinations casters can be used for difference devices,below are brief introduction.

1.In combination with three caters: can be used to carry or transport small devices,flexible maneuverability

2.Two fixed casters with one swivel caster,suitable for short distance transportation of  low center of gravity light equipment.With better direction controlling

3. Two fixed casters with two swivel castors,for heavy equipment's long distance transportation

4.Four rigid casters,suitable for heavy devices long distance straight moving, But can not work on slope surface.

5.Four swivel casters wheels,suitable for heavy equipment long distance moving,excellent rotation function,usually used in a slope surface