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Made in the U.S.A. by Bridgeport.
This is a used Bridgeport Quick-Change Master Holder + Bridgeport Holders Set in GREAT condition. One of the holders is broken, and is being included just in case you can use it for something.
A newer equivalent setup like this will run you around Mill Holder Sizes:
(1) 1/8\"
(2) 3/16\"
(2) 1/4\"
(3) 3/8\"
(2) 1/2\"
(1) 5/8\"
(2) 3/4\"
(1) 7/8\"
Shell Mill Holder Sizes:
(1) 1/2\" pilot
(1) 1\" pilot
Drill Adapter Holder Sizes:
(1) #0
(1) #1
(2) #2
(1) #6
(1) #1 threaded (5/8\" x 18tpi)
Drill Chuck:
(1) Jacobs #11N Keyed Chuck (0 to 3/8\" capacity)
Shank: R8
Overall Length of Master: 6\"
Comes as shown in pictures.
-Ref 372-33