The FEIN 30762533990 Genuine Speed Setting Switch is an original replacement electronic speed-control component for selected FEIN WSG15-70Inox compact angle grinders and GHB15-50Inox hand belt grinders. It is used to adjust the machine’s operating speed and is suitable for replacing a worn, damaged or failed original speed controller. FEIN’s official parts catalogue identifies 30762533990 as “Drehzahlsteller” (speed controller), and the same part is used across compatible 220V and 230V machines.