Selected 20CrMnTi material, high hardness, wear resistance. Widely used for clamping cutters, drills, reamers and other cutting tools. Speed: 25000 rpm carburizing and quenching process to make the handle withstand certain impact and load, strong toughness, super clamping force, no looseness, no deformation, exquisite craftsmanship bring smooth surface and no harm to your hand operation. Specification: Product Model: CNC Tool Holder Model: BT30-ER32-70 Use: CNC machining Working length of tool post: about 70mm Nut diameter: about 50mm Spindle taper: 7/24 Speed: 25000U/min Main body accuracy: 0.002-0.005mm Coaxiality: less than 0.005mm Overall clamping accuracy: 0.002-0.005mm Hardness: 52-58HRC Colour: Silver Material: 20CrMnTi <br><br>Package Contents: 1 x BT30-ER32-70 Milling Tool Holder / Made of 20CrMnTi alloy steel, the product is resistant to high pressure and explosion-proof, the chuck tool holder is quality guaranteed, long service life, excellent price, and high cost performance. The product is your good choice. You can use this tool holder for all kinds of CNC milling machines. The chuck, the tool has high precision and excellent performance. Specification: Item type: Chuck chuck rack Model: BT30-ER20-70 Clamping range: about 1-13 mm/0.04-0.5 inches Length: Approximately 70 mm Colour: Silver Material: 20CrMnTi <br><br>Package Contents: 1 x BT30-ER20-70 Milling Tool Holder<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.