(1)size and expression of rectangle tube

A: long border B:short border S:thickness r:radii of inside and outside inverse angle.

Minimal:A=6mm B=4mm S=0.6mm

Maximal:A=46mm B=25mm S=2.0mm

(2)size and expression of square tube

A:long square S:thickness r:radii of inside and outside inverse angle

Minimal:A=6mm S=0.6mm

Maximal:A=46mm S=2.0mm

(3)Dimension and expression of D tube

A:long border B:short border S:thickness r:radii of inside and outside inverse angle R:radii of round C:length of chord

Minimal:A=6mm B=4mm C=5mm S=0.5mm

Maximal:A=46mm B=40mm C=35mm S=2.0mm

(4)Dimension and expression of elliptic tube and other electrician material

A:long border B:short border S:thickness

Minimal:A=6mm B=4mm S=0.6mm