Super Burs #559 Six Packs by Geo E. Beavers

I have 6 packs (15 available) of #559 dental burs, "Super Burs" made in Canada by Geo E Beavers; I don't know the exact age but believe that they come from before 1974 when the company was sold (there is no mention on the packaging of any corporations or the parent companies that have owned it since then). They are right angle burs and come on a wood backing. They are about 7/8" long; for non dentists they are used in jewelry making.