ETP G2 Slender Hydro Chuck - HSK-63FSize Chart Code D1 D2 D3 L1 L2 L3 D* max RPM 642680 12 32 40 43 61 87 40 25,000 642690 16 38 40 43 61 87 40 25,000 642700 20 40 50 55 73 99 52 25,000 639130 25 45 50 59 77 103 56 25,000 *Cut More for longer with the ETP G3 compact hydro chuck. Extend your SpiralX Advantage compression tool run time by up to 30%. This chuck is good for up to 1000 clamping cycles. (Approx 10 years), and balanced at G2. 5 at 25,000 RPM. The maximum runout is no more than