This is a catalogue and reference to insulators and other relatedmaterials. 162 pages full of information. Pages of supplier catalogs that place the correct name on lots of those odd-ball pieces that come your way. Spools, cleats, bushings, clamp insulators, and many more.....Brackets, tools, linemeans equipment. This really will be a well used reference. The book is in very good condition except for a black paper that ran along the left side of the book. I`m asking $12 and that includes the shipping. I know you`ll get your moneys worth.