The measuring faces are lapped and polished for straightness and parallelism The 45 degree square is manufactured to strict DIN 875/2 standards It is also suitable for woodworking. Product details: Top highlights: 6 Cans of GX3 Plastic Restore, Protects any Plastic, Rubber, Leather or Vinyl Surface 45 Degree Miter Square Steel Machinist Square Woodworking Precision Square 5... Kinex 4007-02-120 Miter 45 Degree Try Machinist Square with Specification: Material: Carbon Steel(45 Steel) Precision: DIN 875 Grade 2 Size:150x100mm(6x4 inch) Thickness:5mm(0.2inch) Package Included: 1 x 45 Degree Square NOTE: The square wrapped in clear plastic with oil on it for protection, it's very easy to wipe off with a towel before use. The 45 degree square is manufactured according to DIN875/2 standard. Commonly used to detect the angle of the weldment, measure the 45 degree deviation of the inner and outer corners of the workpiece and scribe the workpiece, and use it to check the 45 degree angle between the equipment and the components in the structure. Made of 45# steel, the measuring arm is precisely machined from one solid steel blank to maintain durable squareness Engineers Square Boomgood Engineer Square With Angle Ruler, Hardened Ghana Escuadras De Carpintero