Shank diameter: 10mm Shank length: 100mm Extension rod diameter and other parts are precision ground to eliminate imbalance and increase safety during cutting operations. Reduces the need for additional extension tools, helping to lower costs and improve efficiency. Spring collet provides high clamping force, wide clamping range, and high accuracy. Suitable for boring, milling, drilling, tapping, grinding, and other machining applications. Color: Silver + Black Material: Steel Shank chuck model: C10 ER8A 100L Spring collet gripping range: 2mm to 5mm (2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm) Spring collet model: ER8 Package includes: 1 x Straight shank chuck 7 x Spring collets Note: The package includes only the items listed above. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance: +/- 1-3cm.