High quality material, the calibration is clear, close to the center of the positioning ruler, there are 45 and 22.5 degrees for quick angle measurement. Strong and durable, thicker and wider, toughness, not easy to oxidize, easy to carry, perfect corners in your woodworking projects. </ li> Raised gradation (in inches and millimeters) on the inner and outer edges of each square The practical interior notch further improves squaring precision Ideal for gluing and assembling boxes, drawers, frames, furniture, cabinets, etc. Size: 4 pieces 100x100 mm Characteristics: Material: Plastic Color: Red Orange Size: 10 * 10 * 2 cm / 4 * 4 * 0.8 inch Package Contents: 4 x 4 inch 90 angle positioning brackets Instructions: To place a square in the corner of the two pieces You must align yourself with two pliers.