Genuine Bogen Manfrotto assembly sleeve for the 055CXPRO3, 055CXPRO4, 055CXV3, 055CX3, 055MF3, 055MF4, 055MFV, 440, 441, 442, 443, 444, 449, 694, 695, 536, 535, 694CX, 695CX, 745MF3, 754, 755CX3, 755MF3, MT057C4, and the MT057C4-G NGET2. Size = 29/25. Made by Manfrotto Italy.