Made of high quality 40 chromium material,high hardness and durable. Can reduce the use of tools, reduce costs, improve efficiency. Extension rod diameter and other parts are precision, to eliminate unbalance and increase safety when use. Straight extended shank fits for deep processing, meeting the needs of extending the depth of processing. Widely used in milling, drilling, tapping, grinding and other processing. Specification: Material: 40 Chromium ER20-14: Outer Hex Nut Outer Diameter: 3cm; Diameter: 14mm; Rod Outer Diameter: 25mm; Stereo Length: 50L (Include nut length 58mm) Package Includes: 1 Piece Motor Shaft Collet
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