Oyster shell in the grit will be absorbed to give calcium to aid in shell production .
Chickens need to eat grit to help digest their food. Grit helps grind down the food the hens eat because as everyone knows, chickens don’t have teeth.
Flint Hen Grit is a very hard insoluble grit of great benefit to all poultry. In the gizzard it acts as the birds teeth and performs the grinding action necessary to make the food digestible.