The number of individual units of a given SKU number that are required to make up a larger unit. This term may be used in production to list the quantity of a specific item that is required to create a complete set or assembled finished product (quantity per assembly). Or, it may be used on a bill of lading or packing slip to indicate the number of units required to make up a box, carton, package, etc. For example, a given item might have a quantity per box of 10 individual units for sales purposes.