John Gill Commentary 1 Chronicles 23:29

"for the showbread also, and for the fine flour for a meal-offering, whether of unleavened wafers, or of that which is baked in the pan, or of that which is soaked, and for all manner of measure and size;" — 1 Chronicles 23:29 (ASV)

Both for the shewbread
Also to make and get that ready every week for the priests to set on the shewbread table, when they took off the other that had stood a week, see (1 Chronicles 9:32)

and for the fine flour for meat offering, and for the unleavened cakes,
and for that which is baked in the pan, and for that which is fried ;
to deliver out the flour of which these several things were made, see (1 Chronicles 9:31) , and (Leviticus 2:1) ,

and for all manner of measures and size; as the hin and the ephah ,
and the several parts of them for things both liquid and dry, which were in their keeping, and according to which they gave out the proper quantity of oil, and wine, and fine flour, upon occasion.