For woodworkers, being a few cards short of a full deck can be a good thing. Because they’re stiff, waxy, and of uniform thickness, old playing cards can find new life as glue applicators, squeeze-out scrapers, and shim stock. If you like chasing thousandths of an inch, you can double-check your deck with a micrometer, but standard playing cards are typically between .011" and .012" thick.