These simple to use insulators are used with staples to clamp wire or polywire to a wood post. The wire is put in the center and the insulator is closed up around it. A staple is then slid around the entire insulator and nailed directly into the woodFeatures Staples included Fast and easy to install Plastic piece opens insert conductor staple to fence Fence Post Type - Wood Attachment Position - Front or Back Attachment Method - Staple Insulator Conductor Type - Polywire Wire Insulator Material - High Density Polyethylene Color - Black Dimension - 8 x 8 x 3 in. Item Weight - 1.4 lbs. - SKU: FMSP024