High-precision 90° square ruler: Ensures accurate right-angle measurements for woodworking and metalworking. Knife-edge design: Sharp edge fits flush against surfaces for improved measuring accuracy. construction: Made of stainless steel or alloy, resistant to bending and corrosion. Versatile usage: for carpentry, furniture making, work, and engineering inspection. Easy to read and use: Clear markings and ergonomic grip for professionals and DIY enthusiasts., Manufacturer: CFWWSAQ