Sandstone grinding disc is usually composed of abrasive and binder, which has high grinding efficiency and wear resistance. They are suitable for fine grinding and polishing hard materials, such as metals and stones. The grinding effect of sand and gravel grinding disc is faster, but it may produce more heat and dust.

Bluestone grinding disc is usually made of natural bluestone, which has good pressure resistance and wear resistance. They are suitable for grinding and polishing soft materials, such as wood and plastics. The grinding effect of bluestone grinding disc is relatively slow, but it can provide better surface quality and accuracy.