The genuine STIHL 63384300400 Dead Man's Switch is a critical safety component designed for various STIHL RMA series cordless lawn mowers. This essential switch ensures the blade stops quickly when the operator releases the handle, preventing accidents. Manufactured to STIHL's rigorous quality standards, it provides reliable performance and direct fitment for models including RMA 443, RMA 443 C, RMA 448 PV, RMA 448 RV, RMA 448 V, RMA 448 VC, RMA 460, RMA 460 V, RMA 510, and RMA 510 V. Weighing approximately 0.02 kg, this switch is a precise replacement part for maintaining the safety features of your STIHL equipment.