[ Premium Material ] -- The head of the wood post insulator is made of high-quality PP+PE materials, smooth surface without thorns, high hardness, excellent resistance to high and low temperature, no deformation. The screw-in insulator body is made of high-quality carbon steel, with anti-rust coating and sharp self-tapping threads. [ Angled Slot Design ] -- The electric fence ring insulators angled slot design can make to hold electrified wire without energy loss, The screw fence insulators can fix wire firmly and reduce the abrasion to lengthen the service life of wire. Keep the space between wires and post, prevent electrical shorts. [ Easy to install ] -- Upgraded self-tapping design can easily screw into timber fence by hand, no technical know-how needed. Come with free insulator socket tool, it can be used to connect the insulators and electric drill directly, more labor-saving and efficient. Suitable for most electronic fence energizers and fence ring posts. [ Wide Application ] -- Electric fence ring insulators suitable for 8 gauge through 30 gauge high-tensile steel wires, wires, high-tensile steel wires, aluminum wires, ropes and electric fence tapes, can be used as start, end, corner or line insulator, fit for low impedance and standard load fence controllers. [ Screw-in Electric Fence Insulators ] -- The electric fence insulator ring can be installed to the electric drill, more labor-saving and efficient. Excellent insulation, and rain protection, anti-weathering, which is more eco-friendly, completely harmless to people, pets and wildlife. length 3.7 inch, Width 1.4 inch, Screws Length 1.8 inch. Colour: black Material: metal + plastic Package Contents: 40 x Screw-in Electric Fence Insulators Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.