Features: 1. It is a hexahedron that is made of hardened steel. 2. Ground and hardened on all sides, suitable for all types of machine tools. 3. Used for setup, layout and inspection work. 4. High precision milling parallel clamping block, accuracy up to 0.0001. 5. 23 holes include (5) 3/8-16 threaded holes for clamping and (18) unopened holes. Technical data: Condition: 100% brand new Item type: 23 hole terminal block. Material: hardened steel. Accuracy: 0.0001" Size: approx. 25 x 50 x 75 mm / 1 x 2 x 3 inches. Package list: 2 x blocks. Note: 1. Please allow slight errors due to manual measurement. Thank you for your understanding. 2. Since monitors are calibrated differently, the colour of the item shown in the photos may differ slightly from the actual object. Please take the original as standard.