Product kitting allows original equipment manufacturers (OEM) to choose to create a kit of related items under one SKU. This increases the ease of ordering for the dealer. In the case of kits intended for United States Military or Defense use, the items packaged together must adhere to rigorous quality standards. These standards, known as Mil-Spec, were created to ensure that kitted packages were delivered exactly how the U.S. Department of Defense needs them to be. Mil-Spec standards for kitting focus on reliability, compatibly, usability, identification and labeling, product protection and preservation.