About 35 years ago I bought a relatively expensive, good set of 25 P&N twist drill bits - 1 > 13mm in 0.5mm increments. Over the years I have replaced a number of them (with P&N or Suttons ‘Evacut’, which are really the same thing) when they were lost or went blunt.
They came in a nice pressed-steel box with tiered drill racks. At the time I thought the steel was a bit clunky but looking at it today, the box is still as sound as bell. I’m sure a plastic box would be long since gone due to wear and tear.