High-quality material, the calibration is clear, near the center of the positioning ruler, there are 45 and 22.5 degrees for quick angle measurement. Solid and durable, thicker and wider, hardness, not easy to oxidize, easy to carry, perfect corners in your woodworking projects. Embossed gradation (in inches and millimeters) on the inner and outer edges of each square The convenient inner notch further improves squaring accuracy Ideal for gluing and assembling your boxes, drawers, frames, furniture, cabinets, etc. Size: 4pcs 100x100mm Features: Material: Plastic Color: Orange Red Size: 10*10*2cm/4*4*0.8inch Package Included: 4pcs 4inch 90° Corner Positioning Square How to Use: To place a square in the corner of the two pieces You need to align with two clamps.