In tro du ct io n CERATIZIT designation system ISO tool holders Tool holders D S Retained from above and via bore Retained via centre screw M P 90° ISO boring bars B A A10-A11 75° 90° 90° 45° C 90° D 60° R E 107,5° 93° 75° L F H G 95° 50° J 63° K 75° 117,5° A12-A13 ISO inserts Retained from above and via bore Retained via the bore M L A14-A15 N 60° 45° C T S R P 93° 72,5° V U 60° N W Retained from above 85° X Special version Y S C L Insert shape Included angle Other shapes Included angle A10 Cutting direction Style Clamping method C Clearance angle 35° V 55° D 75° E 80° C 3° A 25° F 86° M 5° B 30° G 55° K 7° C 0° N 82° B 15° D 11° P 85° A 20° E 90° L – R 108° P 90° S 120° H 60° T 135° O 80° W Clearance angles not included within the standard for which particular information is necessary } O R