LEGO Dark Stone Gray Base 6 x 16 x 2/3 with Recess and Holes (52037)

LEGO Dark Stone Gray Base 6 x 16 x 2/3 with Recess and Holes has been used in at least 22 LEGO sets over the past 19 years, since it was first used in 2005. You can also find this part in at least 3 other colors. It has a design ID of 52037 which can usually be found molded into the bottom of the part.