Omnigrip 20.5 x 20.5
This is a BIG ruler that has endless uses Cutting, squaring and setting blocks is simple and easy with this invaluable tool. One of its most unique uses is to set blocks on point without doing the math This ruler also takes the guess work out of cutting squares for size and corner triangle settings. And, just like all Omnigrip rulers, it has a nonslip surface on the under side.