LEGO Dark Stone Gray Brick 4 x 16 Beam for Conveyer Belt Assembly (92712 / 92715)

LEGO Dark Stone Gray Brick 4 x 16 Beam for Conveyer Belt Assembly has been used in at least 8 LEGO sets over the past 13 years, since it was first used in 2011. You can also find this part in at least 3 other colors. It has a design ID of 92712 which can usually be found molded into the bottom of the part.