Main function: This square collet block is mainly used for quick setups on CNC machine tools. High hardness: This square clamp block is made of tool steel material, treated by hardening. High precision: This square clamp block adopts precision manufacturing, with high machining precision. Long workpiece machining: The through hole allows the machining of long workpieces. Suitable for: For parallel, square or hexagonal shapes as well as for drilling cross holes at 60, 90 or 120 degrees. Specification: Item Type: Clamp block Model: ER-32 Material: hard steel Color: silver and black Outside diameter: 50mm Inside diameter: 27mm Item Size: Approx 7x5x5cm/2.76x1.97x1.97in Item Weight: Approx 704g Package Weight: About 737g Package size: Approx 8.5x6.2x6.2cm/3.35x2.44x2.44inch Package List: 1 x Collar Block Note: Others Items are not included, the color is based on the first picture, and other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you! getveryrich Note: The data is all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be some color difference, the actual object received shall prevail.