This black electric fence insulator is made of high quality material, which is sun-proof, rainproof, weatherproof and has a long service life.It is and completely harmless to people, pets and wildlife. This wood post insulators for electric fence easy to install, screws easily into timber fence. Equip with free insulator socket tools to connect the insulator and the electric drill, more labor saving and efficient. Insulators size: Approx 9 x 3.5cm/3.54 x 1.38inch ?. Metal part length 1.57inch.