The POWERTEC 71124 positioning squares, 4-Inch (4-pack) is the ideal solution when you need to square up perfect corners in your woodworking gluing and assembling applications. Featuring a high-impact foamed plastic construction that insures optimal durability and lightweight usability. Unlike metal squares, these handy accessories won't Mar your valuable work materials. It'll be a breeze to create the precision 90-Degree angled woodwork, so essential in ensuring balanced project outcomes. Quickly and easily clamp on the squares and your set to go. Both the inside and outside edges of these multi-tasking squares can serve as exacting measuring guides. And there's more. Embossed gradation (in inches and millimeters) are molded into the squares to provide convenient measuring guidance. A handy interior notch further enhances squaring accuracy. With the POWERTEC positioning squares, 4", you'll have exactly what you need to create perfectly square boxes, drawers, cabinets, frames, furniture cabinets, etc. Some woodworkers even find it useful to incorporate them into their jigs and fixtures.