Get them out for the lads and some pics when you get a chance? 
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We used to have loads of sets at work. Once they failed third party calibration (they lasted a very long time) we just binned them. Should have kept a set, no use for them now but they are just nice things.
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Loved the way you could âringâ them together. Think Iâm remembering that correctly, though the way dementia is insidiously creeping up âŚ
We always referred to them as âslip gaugesâ
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Same here.
Nice to see an imperial set.
The highest grade sets are eyewateringly expensive.
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The fact that they are so precisely ground that the molecules or atoms hold them is incredible.
I wish my work involved such tolerances instead of just to the nearest inch. 
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Foo.
Metal for me.
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Theyâre not just ground, theyâre lapped to achieve the highest tolerances. Proper engineering 
Like using Engineers Blue to check that you had filed edges perfectly flat. Halcyon days, long gone.
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Sadly, yes.
Our sister company had a contract to produce some parts for an aerospace co. and the flatness tolerances were just not possible on their very expensive cnc machines. They took them to an old bloke working out of a lock-up who hand scraped them. Needless to say, they passed inspectionâŚ
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I could have been that old bloke. Some of the fits you could achieve with watered Blue and needle files (Vallorbe ?) you wouldnât believe.
Pah ! This is what you wantâŚ
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Yes quite fancy a Grainfather, or similar. Might just give BIAB a go first before splashing out.
Iâve been brewing BIAB for a few years now. Itâs a very effective way to brew. Well worth a try