Granite V-Block is widely used in workshops, tool rooms & standard rooms for a variety of applications in tooling and inspection purposes such as marking accurate centres, checking concentricity, parallelism, etc. Granite V Blocks, sold as matched pairs, hold and support cylindrical pieces during inspection or manufacturing. They have a nominal 90-degree “V”, centered with and parallel to the bottom and two sides and square to the ends. They are available in many sizes and are made from our Jinan black granite.