I bought that exact set of red-dipped-handled cheapo rifflers 19 years ago (2005, I remember I was still at school, and I think they came from Maplins, possibly

I bought that exact set of red-dipped-handled cheapo rifflers 19 years ago (2005, I remember I was still at school, and I think they came from Maplins, possibly Rapid). They were cheap then too, probably about the same numerical price, perhaps £10 with the Maplins tax, and AliExpress shipping was just a gleam in Jack Ma's eye. Industrial-grade diamond dust has been pretty cheap for a long time.