bit; thread tapping

Description
Thread tapping bit from drilling machine, stamped on the side is "OIL".
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Object detail

Department
Object
Signature & date
Stamped on top of ring:"OIL" on thread is "EX 1/2 3/4" on other side is "3/8 5/8" on bottom of shaft is "EXH" and on underside of ring "EXH"
Measurement type, part and reading
Dimensions:0 - Whole:L 33cm (L 1' 1")
Dimensions:W 9cm (W 3 9/16")
Accession number
1991-011-001

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