Since discovering this indespensible resource on the desk of a coworker, I continually borrow it to use as a reliable sorce of information. If you've ever delt with anyone in the construction industry you know all the funny names they have for funnier looking tools and equipment. This book clearly defines and often illustrates these unusual items. It also provides useful information on common materials and grading systems(ie 2" X 4" is actually 1-1/2" X 3-1/2"). I use this book so much that I've decided to get a copy of my own. I'm sure my coworker will be very pleased.