1 The specifications and pattern of the bothside fitting. The size of hole should specify, otherwise carry out be IEC.
2 The main dimension and rate voltage
3 The colour of silicon rubber, usually it is red or gray
4 Other particular requirement
1. IEC, ANSI, GB and other international stardand is applicable
2. It is usually red, gray and white.
3. We can design and produce according to the drawings and characteristics