EFFECTIVE PREVENT DROP: Equipped with a backrest auxiliary , closely adheres to the side to prevent drops. The support structure keeps the right angle square on the working appearance, freeing your hands without the need for support ACCURATE ADJUSTMENT: L shaped folding right angle square, snap fit angle ruler, 15° adjustment, 330° ruler body rotating, possess clear hand feel and accurate position during adjustment MULTI ANGLE MARKING: Carpenter square ruler makes marking at regular angles effortless, integrate angle setting, measurement, and marking, handling everything in one go EASY TO USE AND STORE: Carpenter square ruler has a built in convenient scribing pin for easy marking. the bottom of the straightedge is equipped with a built in steel pin for marking lines, making it easy to operate and safe for storage CLEAR SCALE: Aluminum alloy framing square has double sided scale, clear and accurate. The scale body is 2mm thick, not easy to deform, the scale is engraved clearly, wear proof and long lasting, Manufacturer: Jnchdghwa