0630100294 Shim: Used for ZF16S2220, 16S2230 transmission, spacing adjustment part for rear synchronous drive. Cut from wear-resistant cold-rolled steel sheet with strict thickness tolerance to fine-tune assembly clearance of synchronizer set, eliminate excessive play and abnormal noise from component abrasion. Selectable thickness for customized installation during transmission overhaul, anti-rust for convenient storage and fitting as essential trim part for synchronizing system assembly.