The marble square boxes are mainly made of Jinan blue and granite with luster and delicate material; Compared to other materials, it has a longer lifespan, black luster, uniform structural texture, good stability, and high strength. The working surface adopts scraping and grinding technology for measuring the straightness and perpendicularity of workpieces and equipment installation.

Purpose: To detect the flatness and perpendicularity of components, workpieces, machine tool workbenches, guide rails, and work. The granite square boxes produced by our company have the advantages of not rusting, not magnetizing, and not changing shape. Can maintain stability under heavy loads and normal temperatures.

Craftsmanship: The benchmark measuring tool made of stone material is an ideal reference surface for the inspection of instruments, meters, and mechanical parts. Granite square boxes are especially used for measurement. Granite square boxes are made from underground rock layers and have undergone billions of years of natural aging, resulting in extremely stable shapes without worrying about deformation due to conventional temperature differences.

Packaging: Granite square boxes are generally packaged in wooden boxes (or according to user requirements)

Specifications: (can be customized as needed)