LEGO Light Gray Hinge Brick 2 x 2 Locking with 1 Finger Vertical (no Axle Hole) (30389)

LEGO Light Gray Hinge Brick 2 x 2 Locking with 1 Finger Vertical (no Axle Hole) has been used in at least 15 LEGO sets over the past 25 years, since it was first used in 1999. You can also find this part in at least 8 other colors. It has a design ID of 30389 which can usually be found molded into the bottom of the part.