LEGO Dark Stone Gray Technic Bionicle Rhotuka Spinner Holder with 2 Pins and Axlehole (50901)

LEGO Dark Stone Gray Technic Bionicle Rhotuka Spinner Holder with 2 Pins and Axlehole has been used in at least 25 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 50901 which can usually be found molded into the bottom of the part.