Features: 1. In the 23 holes, 5 holes are 3/8-16 threaded holes, and the rest are straight holes with an accuracy of 0.0003 inch. 2. Accurate installation work is possible. 3. Hexahedron, made of hardened steel. 4. Four sides are ground and hardened. 5. Used to set up, layout, and check jobs. 6. Suitable for all kinds of machine tools. 7. Cross-drilling design for minimum weight and maximum strength. 8. Scope of application: For clamping support, installation design and inspection work. Specification: Condition: 100% Brand New Item Type: Parallel Clamping Block Material: Steel Number of holes: 23 holes Accuracy: 0.0003 inch Package List: 2 * Parallel Clamping Block Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.