1、[Premium Construction] Crafted from A grade engineering plastic, this rafter square tool boasts a sturdy structure that ensures longevity in various work conditions. It features dual sided scales that are abrasion resistant. 2、[Flexible Positioning] Equipped with three sliders for flexible positioning, allow for easy disassembly. The positioning hole is 4.5mm in diameter, recommending the use of 3 to 4mm drill bits for drilling. 3、[Versatile Use] Besides serving as a measuring tool, the carpentry square can also be utilized for drilling positioning. Adjust the slider positions effortlessly based on the depth of the cabinet side panels, facilitating accurate drilling and screw insertion. 4、[Seamless Solid Base] The seamless solid base ensures a consistent alignment between the base and ruler. The smoothly and delicate surface guarantees user comfort and durability, preventing hand fatigue during use. 5、[Essential Carpentry Tool] The positioning triangle ruler is a multipurpose tool suitable for accurate measurements, drilling hole positioning, and marking tasks, making it indispensable for various woodworking projects.