Mac tool thread repair. Looks like. Has been used by one person. Retired and do not need now.
Mac Tools Thread Chaser #TRC897A Vintage
3Pcs Thread File Set, Thread Restorer File Set, Thread Restoring Chaser Files...
UNC/UNF/Metric Thread Repair Kit Thread Restorer Tool 42PCS Thread Chaser Set
15-Piece Metric Thread Chaser Set M6 M8 M10 M12 Thread Restorer Tool Thread Set
Metric Thread Chaser Set 15Piece M6 M8 M10 M12 Thread Restorer Tool Thread Set
Uimoso 49PCS Thread Chaser Set UNC UNF Metric Thread Restorer Tool Rethreading
