the poly wire insulator is not just only used for poly wire, also can be used for steel wire,  some insulators can be used for poly wire, poly rope and poly tape together.

If we name electric fence insulators based on the application,  we can classify the electric fence insulators as poly wire insulators, poly rope insulators and poly tape insulator. the poly wire insulators have ring insulator, staple insulator, offset insulator, pigtail insulator, etc.