MaterialThe magnetic starter is made of steel housing and a durable contactor, air compressor magnetic starter control with an On/Off button including a push button and On-Off switch rubber grommets.Great FunctionGreat powerful, built-in overload protection, and protection, intelligent protection, stable performance, and 24-hour motor protection.Easy to UseFeatures color-coded ON/OFF push-button control, this electrical switch box directly controls your motor's power while also providing protection from workshop dust.InstallationSteel housing with four 3/4" punch out holes for input and output wires. Includes three rubber grommets for the 3/4" holes to protect connecting wires.