zillah2004

Measuring drill bits sizes

zillah2004
3 months ago

Hi All

I have a box of quality drill bits that seem to be new but their engraved sizes covered by rust ,,,,I tried to sand them to see their sizes but still I am finding difficulty
What would be the correct way to determine the drill bit sizes?( i.e. Measure tip of a bit or flute of a bit or shank of a bit )?

Attached photos showing 4 new Sutton SDS plus for masonry (4mm, 6mm, 11mm, 16mm) not been used and still have their tags showing sizes

SDS bits their tips are wider than the flute unlike other types

I tried to do a test by using 3 different types of drill gauges but I can't fit the drill bit size 4mm into the hole 4mm and same issues with other sizes 6mm, 11mm, 16mm

Thx





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