Mower Disc 56452100 fits Kuhn GMD55HD GMD66HD GMD77HDOne New Aftermarket Replacement Heavy Duty Mower Disc for Kuhn GMD Series Disc Mowers This heavy duty replacement mower disc is a key component of the cutterbar assembly on Kuhn (and compatible Fits John Deere and Fits Ford New Holland) disc mowers. The disc mounts to the cutterbar and carries the mower blades, taking direct impact during cutting operations. The heavy duty designation indicates reinforced construction for demanding hay cutting