HSK-80A GUHRING Central Coolant Through Shell Mill Arbor, 27mm Arbor Diameter, 55mm Gage Length HSK-A to ISO 12164-1/DIN 69893-1 | to hold shell mills DIN 841, arbor-type single angle cutters DIN 842 with keyway, shell mills DIN 1880 with keyway and milling cutters with inserts DIN 1830 | bore-? 40 and 50 mm has four additional holes with internal thread for milling heads with tool attachment DIN 2079 | for central coolant supply ? completely assembled with milling cutter retaining screw, Guhring no. 4908, drive dogs, Guhring no. 4922 and feather key Guhring no. 4923 ? order coolant supply set article no. 4949 separately. Series No. 4361, Order Code 027.0800. Made in Germany, Guhring Part #9043610270800