LEGO Dark Gray Cylinder 3 x 6 x 2.7 Horizontal Hollow Center Studs (30360)

LEGO Dark Gray Cylinder 3 x 6 x 2.7 Horizontal Hollow Center Studs has been used in at least 4 LEGO sets over the past 25 years, since it was first used in 1999. You can also find this part in at least 16 other colors. It has a design ID of 30360 which can usually be found molded into the bottom of the part.