Props are designed with different legnth to and types to meet different requirement for construction. Normally known as Light Duty and Heavy Duty.
The Props are with different design in different regions. Such as the Acrow Props are widely used in European countries. And light duty Props are normally used in Asia, Middle-East and some Africa countries. And in Spain, Portugal and Italy, they have their own type.
However, the Props are normally designed by clients. They can choose the different kinds of Props to meet the construction demand.