Brand new and excessive qualityType: clamping nutModel number (optional): ER11-A, ER16-A, ER20-A, ER11-M, ER16-M, ER20-M, ER25-UM, ER32-UM, ER40-UMHigh accuracy: 0.005mm jumpMaterial: chromium-molybdenum steel (20CrMoTi)Surface hardening: HRC 52-55Internal taper accuracy class: 4HSuitable for spindle speed: <30000rmpFeatures:- High-precision chuck ER 11/16/20/25/32/40 A/M/UM clamping nut milling cutter chuck.- Industrial-grade high-end reliable ER locking nut.- Made of nice chromium-molybdenum metallic (20CrMoTi).- Strong clamping force, difficult to deform.- Reduce vibration and noise.- Suitable for different ER kn ife holders (BT-ER). NT-ER, MTA-ER, MTB-ER, R8-ER and ER immediately extension handle).Notice:1. The genuine colour of the thing may be barely varied from the images shown on the web content caused by many factors comparable to brightness of your video display and light-weight brightness.2. Please allow slight guide size deviation for the data. Thank to your understanding.3. 1cm=0.39''.Package Included: 1x ER Clamping Nut