【Durable Material】The rafter Square is die-cast from heavy-gauge aluminum alloy which enable it to last long and still give accurate measurement. The combination ruler itself is die-cast from zinc alloy and carries a steel ruler made of stainless steel with a matte finish. 【Clearly Identifiable Scale】The rafter square finishing features low glare and protective powder coated. It has permanent deep markings and white graduations for max Readability any lighting. The stainless steel ruler of combination square has deep etching scale for superior legibility and long-lasting usage 【Multiple Graduation】 7-inch rafter square has many kinds of graduation which blends the features of framing square, try square, miter square, and protractor square. The combination square has a 12-inch stainless steel ruler which has 3 types of minimum scale value: 1/16”, 1/32” and 1mm. 【User-Friendly】Lipped fence allows you to easily brace the rafter square flush with the wood, creating a straight or angled line that is proportionate to the wood's edge. The spring screw of the combination square makes you easier to detach the stainless steel ruler and smooth ruler is easier to slide for your measurement. 【Wide Versatility】 Easy-to-read level vial and a metal scriber on the side of the combination ruler increase product practicality and versatility. The rafter square can be used as a guide for cross-cutting lumber. They both work accurately at an angle 90 degree or 45 degrees.