The OEM Ryobi Start Key 205283001 is a red plastic key switch designed for use with Ryobi cordless mowers, specifically the RY401012 and RY401120-Y 20" models. This key is essential for starting and operating the lawn mower, ensuring that the mower is securely powered on during use. The key is made by the original manufacturer, Ryobi, ensuring a perfect fit and reliable performance for your lawn mower.