Auxiliary Tool CNC Chuck Shock Resistant Chucks For ER 20 Feature:1. Good workmanship: forged in vacuum quenching furnace to achieve carbon and oxygen co infiltration, increase hardness and increase service life.2. Center hole design: the central through-hole design can facilitate water cooling, effectively dampen vibration, and enhance shock resistance.3. Multi-purpose Use: A square tool holder that can be used to hold tools of different diameters, which has good versatility and reduces processing costs.4. Great Material: Made of premium 20CrMnTi, it is not easy to deform, it also has excellent durability for long-term use.5. Easy to carry: The box greatly simplifies storage and carrying, and the installation is very easy. Specification:Item Type: Auxiliary Tool HolderProduct Material: 20crmntiProduct Model: TB20 20-ER20A Square Size: Approx. 20x20mm/0.8x0.8inProduct Length: Approx. 132mm/5.2inApplication: Suitable for ER 20Package List:1 x Auxiliary Tool Holder for 1 x Storage BoxNote:Ask professionals to operate. 1) we accept Alipay, West Union, TT. All major credit cards are accepted through the payment processor's secure escrow. 2) Payment must be made within 3 days of placing the order. 3) If you can't check out immediately after the auction ends, please wait a few minutes and try again, payments should be completed within 3 days. About Shipping 1.