Genuine Bogen Manfrotto locking knob for the 190, 190B, 190CL, 190CLB, 190CPKIT, 190D, 190DB, 190MFV, 190NAT, 190NAT2, 190NAT3, 190PRO, 190PROB, 190SH, 190SHB, 190SS, 190SSB, 190V, and more. The knob assembly includes the knob, and spring. Made by Manfrotto Italy.