This arm is a critical part of the rear wheel housing assembly for commercial-grade push and self-propelled mowers. Primary Function: Acts as the mounting arm and height adjuster for the left rear wheel. Fits Models: * HRC216 (HDA, HXA versions) HRC216K2 (HXA) HRC216K3 (HDA, HXA) Material: Heavy-duty forged metal designed for commercial use, often featuring a rust-inhibitive coating. Placement: Specifically for the Left Rear position (when standing behind the mower).