This Rack Gear from Manfrotto is a gear that is turned by the crank handle to raise and lower the center column on various tripods. It is sold here as a replacement or spare part.
Compatible with the following tripods: 028B, 058, 058B, 075, 075B, 117B, 117MV, 117X, 161MK2, 161MK2B, 475, and 475B.
UPC: 719821249153