LEGO Black Hinge Brick 1 x 2 Locking with Single Finger (Vertical) On End (30364 / 51478)

LEGO Black Hinge Brick 1 x 2 Locking with Single Finger (Vertical) On End has been used in at least 47 LEGO sets over the past 24 years, since it was first used in 2000. You can also find this part in at least 16 other colors. It has the design IDs 30364, 51478 which can usually be found molded into the bottom of the part.