6 SETS OF NOS 1" D HEAD HIGH SPEED MILLED THREAD CHASERS IN ORIGINAL BOXES

Three are made by Firth Brown Tools Galt, Ontario

- 1/2 x 13,  5/8 x 11,  3/4 x 10

Three are made by Hi - Speed Tools Ltd. Galt, Ontario. 

 -  9/16 x 12,  5/16 x 18,  3/8 x 16

5 of the sets appear to be New Old Stock