Lot of large industrial power diodes T6 F10T

Lot of three large industrial diodes from the estate of an industrial controls engineer. We've been told that these are power diodes, but we don't know much about them. They are marked T6 and are also stamped F10T (we think?). These measure 3 1/8" long overall and 3/4" across the threaded stud.

Item No. b501505
SOLD