Corrosion & dent proof high density polyethylene housing. Swivel model rotates 360 degree in 12.5degree increments and locks in place with a steel locking pin. 10in Hard Rubber Wheels External junction boxes on dual voltage models allow units to be wired for either voltage without removing guards. Hazardous Location Models have explosion proof motors and external junction boxes rated for Class I, Group D and Class II, Groups E, F & G, U.L. Listed. MOTOR:1-speed, permanently lubricated ball bearing. SWITCH: Rocker on 120 v 1 Phase models. CORD: SJT type 3 conductor, 12ft long on 120 v 1 Phase models / no cords on dual voltage models. BLADE : Aluminum GUARDS: Spiral wire - front and rear