expanded metal is steel sheet that has been slit then stretched to create a diamond or hexagonal style. People can use it in many ways
The specifications as below:

Strands are individual slit metal strips, or the sides of a diamond opening.

SWD, or Short Way of Design, is the distance between a point on a bond to a corresponding point on either nearest bond across the shorter dimension of the opening.

LWD, or Long Way of Design, is the distance between a point on a bond to a corresponding point on either nearest bond across the longer dimension of the opening.

SWO, or Short Way of Opening, is the distance measured from the inside of a bond to the inside of either nearest bond across the shorter dimension of the opening.

LWO, or Long Way of Opening, is the distance measured from the inside of a bond to the inside of either nearest bond across the longer dimension of the opening.

The expanded metal mesh is firm, has a wide range of applications, and has a long life. It is used for highways and railway guardrails.  construction industry, national defense, petrochemical industry, aquaculture industry. Agriculture ,and a framework for carrying goods.

Steel mesh is a variety in the metal screen industry. Also known as metal mesh, diamond mesh, iron mesh, metal expansion mesh, heavy steel mesh, foot mesh, perforated aluminum plate mesh, stainless steel mesh, granary mesh, antenna mesh, filter mesh, audio mesh and so on.