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 wood Quick and very easy to use Very simple and inexpensive Staples are included Packaged 50 per pack Main color is Black Brand : Field Guardian UPC : 814421012722 Model NO : 102169