Inexpensive rigid polymer corner brackets for checking, clamping and holding the angle and position of your project until the adhesive sets or your operations are complete. The corners are chamfered so that the adhesive leaking out of the joints does not come into contact with the square and the dirt does not prevent the device from penetrating firmly into the corner joints. The cross brace on the block adds strength without adding weight, allowing you to clamp any edge you choose. The material appears to be resistant to most adhesives, making it easy to clean. Angle clamps are expensive and bulky and not suitable for too many applications. These handy squares are a brilliant solution to a common problem as you can use whatever clips you have on hand as corner clips. I liked them so much I bought two more sets of six.