REPLACEMENT SEATS FOR ISO LEVER LOCKING HOLDERS (P-TYPE HOLDERS) Ingersoll offers several replacement seats that are exchangeable with ISO Lever Lock Holders. However, for best performance, Ingersoll recommends that the HB insert be used with its exclusive H-type holder to maximize tool life. Seat for ISO Lever Lock Description Shape Seat for H-type Holder (P-type) Holder CNMX 55_ LSC 54-NX LSC 53-NXLSC 53-NXS SNMX 55_ LSS 54-NX LSS 53-NXLSS 53-NXS LSC 53-NX: Same IC as Insert IC LSC 53-NXS: Slightly smaller size than Insert IC 145