Introducing the Tape Measure Square Check Tool by POWERTEC. This handy tape measure attachment tool is designed to provide you with a quick and accurate solution to determining the length and squareness of your projects. It's unique design helps prevent your measurement tape from slipping off the corner when measuring workpiece surfaces – making it ideal for anyone operating without a second set of hands. Perfect for diagonal measurements, the 360-degree rota-table head and 90 degree inside corner allows for use with any square and rectangular project. Easy to Use Simply insert the metal tab of your measuring tape into the handy tab slot and place the interior corner of the check flush to the corner of your work piece. A powerful magnet locks your tape securely into position - effectively preventing the measuring tape from slipping and delivers high precision and accurate angled measurements. Features A premium grade plastic construction for long-term durability. Universal 1-1/8” wide slot to fit most standard tape hooks. Magnet to help keep your tape measure securely in place. Common Woodworking Applications Cases | Drawers | Frames | Wooden Boxes | and so much more! POWERTEC is a leading manufacturer of high quality woodworking tools and accessories, machines, and an assortment of OEM replacement parts. We are committed to exceeding expectations, while bringing the latest innovations, technology, and product development to the industry.