3/8" Weldon End Mill Holder, CAT40, 2.5" Gage Length

For 3/8" Weldon-shank end mills, DIN 1835-B. CAT40 taper to ANSI B5.50, side-lock body to DIN 6359. Balanced to G2.5 at 20,000 RPM, runout within 0.005 mm. AD coolant through the flange, 5/8"-11 retention knob thread. Retention knob sold separately.