Lunar plaques are stainless steel commemorative plaques measuring 9 by 7+5⁄8 inches (22.9 by 19.4 cm) attached to the ladders on the descent stages of the United States Apollo Lunar Modules flown on lunar landing missions Apollo 11 through Apollo 17, to be left permanently on the lunar surface. The plaques were originally suggested and designed by NASA's head of technical services Jack Kinzler, who oversaw their production.