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Drill bit

Drill bit

Flat drill bit

Flat drill bit

1945-1975
20 Archimedean drill bits, in box

20 Archimedean drill bits, in box

1 37/64” masonry drill bit

1 37/64” masonry drill bit

1948-1953
HSS drill-bit, to fit oblong jaw chuck

HSS drill-bit, to fit oblong jaw chuck

1960
Drill bit attachment.

Drill rod, coal mining

Steel drill bit coated with gold-coloured titanium nitride.

Steel drill bit coated with gold-coloured titanium nitride.

Multi-stage drill bit.

Drill bit

Steel drill bit coated with gold-coloured titanium nitride.

Steel drill bit coated with gold-coloured titanium nitride.