Features It is a hexahedron which is made of hardened steel. Ground and hardened on all sides, suitable for all kinds of machine tool. Used for set-up, layout and inspection jobs. High accuracy milling parallel clamping block, accuracy up to 0.0001". 23 holes include (5) 3/8-16 threaded holes for clamping and (18) unopened holes. Specification: Condition: 100% Brand New Item Type: 23 Holes Clamping Block Material: Hardened Steel Accuracy: 0.0001" Size: Approx. 25 * 50 * 75mm / 1 * 2 * 3in Package List: 2 * Blocks 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. Package List