Incra’s Precision Squares and Miters will always stay perfectly square even if accidentally dropped thanks to the innovative one-piece design. The hefty construction of the 1/4" solid aluminum alloy body and 3/4" thick integrated alloy handle just feels right. The design also features a support lip that holds the square on the edge of the work piece for marking and layout. Each square comes individually boxed with a certificate of accuracy stating that the angular accuracy is guaranteed to be less than 0.001" (one thousand) maximum deviation from nominal at any point along the full length of the blade. The 90 degree square and the 45 degree miter are both available with either a 5" or 7" long blade. Made in USA. Click on any tool below for more details.