Description: High Strength: The 90 Degree Positioning Squares Ruler has a aluminum body and reinforced joint design for extra strength.90 Degree Positioning Square: The L Shaped Auxiliary Fixture is designed to help keep joints at ninety degree.Multiple Uses: Square right angle clip is suitable for bathtub seams and picture frame seams. Used to assemble boxes, drawers, cabinets, furniture cabinets, etc.Helper: Angle clamp is widely used in the wood workings industry and are a good tool for carpenters. It can quickly measure or make right angle molds, and quickly make workpieces such as photo, right angle borders, and right angle corners.Clear scale: The L Shaped Auxiliary Fixture has clear scale and can be used for quick measurements; it uses high strength engineering plastics, which have high hardness, and resistance to falling, and is strong; widened, and thickened, it is suitable for more workpieces. Specification: Material: Aluminum Alloy Size Chart: 120mmx120mmx16mm/4.72inchx4.72inchx0.63inch Package Includes: 1 Positioning Square Ruler Note: Please allow slightly errors 1-2cm differences due to manual measurement.