All metal
One standard 12 inch imperial with 1/8ths, 1/16ths, 1/32nds and 1/64thsz

The other 4 are contraction rule.
Used by patternmaker or model makers for making patterns for the foundry industry as they allow for shrinkage of metal when cooling so they end up the correct size you want.

Metric ones are 500mm long plus a little bit at the end.
One shows 1/50, 1/70, 1/90, 1/100.
Two the same have 1/30, 1/40, 1/60 and 1/80. One of these is slightly thicker than the other but the same effectively.
The other is an imperial one showing 1/38, 1/48, 1/77 and 1/96. This is 24 inches long just over.
Yes they have all been used but still good to use or as a collectors item.

PLEASE. ENSURE UOU PICK EVRI FOR POSTAGE DUE TO LENGTH

Please see many other lots for other bits similar for anyone starting out as either a model maker or pattern maker or other engineer.

Please note I do try my best to ensure my write ups accurate and correct as I can but just occasionally I might miss or get something a little wrong. So I always as please check out my photos for all information you need.
If in any doubt please check out my feedback.
Please also bear in mind eBay set postage costs here not me working on simple delivery and size and weight of item so I don’t make anything from it even though it costs me for packaging materials.
Many thanks for looking.