Lot of 6 vintage twist drill bits with square tapered shanks, CELFOR brand

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Lot of 6 vintage twist drill bits with square tapered shanks, CELFOR brand:
$9.50

A vintage lot of 6 twist drill bits with a square tapered shank. The shank measures approximately 5/8\" square at largest end and 3/8\" square at smallest end. There are 5 bits that measure 1 inch diameter and one bit is 1 1/4 inch. Not sure what they fit. Has CELFOR on shanks. Thanks for looking.