Retention Knob DIN69872 (DM-406) Properties and application: Used with DIN69871 taper toolholders A - through hole version B - blind hole version Specifications: ModelD[mm]D1[mm]D2[mm]M[mm]L[mm]L1[mm]L2[mm] DM 406 30A/B 13 9 13 M12 44 24 19 DM 406 40A/B 17 14 19 M16 54 26 20 DM 404 50A/B 25 21 28 M24 74 34 25