Premium QualityPositioning squares with impact-resistant plastic construction that ensures optimal durability and easy use. Bullet Point 90 AngleIt will be a breeze to create precision 90 degree right angle woodworking which is essential for ensuring balanced results. Quickly and easily clips onto squares. A Variety of SizesA variety of 3", 4" and 6" sizes for more woodworking pieces. Can be used on any thickness of wood, no thickness limit, meet your different needs. Easy to useMulti-angle scale near the center of the positioning ruler to right angle, there are 45 degree and 22.5 degree divisions for easy angle measurement. Graduations in inches and millimeters) on the inside and outside edges of each square. Convenient inner taper further enhances quadriro accuracy. Wide ApplicationYou have exactly what you need to create square boxes, drawers, cabinets, frames, furniture cabinets, etc Some woodworkers even find it useful to incorporate them into their equipment and devices. Satisfaction, high utility, squared efficiency.