Shank diameter: 10mm Shank length: 100mm The extension rod and other components are precisely ground to ensure balance and enhance cutting safety. This tool reduces the need for extension tools, lowering costs and improving efficiency. The spring collet features a strong clamping force, wide clamping range, and high accuracy. Suitable for boring, milling, drilling, tapping, grinding, and other machining processes. 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 Only the items listed are included. Note: Lighting and different displays may cause slight color variations. Measurement error allowance is +/- 1-3cm.