- Two blades for easy conversion to 30 amp or 50 amp plug. - 50 amp plug with flat blade. - Includes L-shaped blade for 30 amp 125/250 volt use (NEMA 10-30P) and flat blade for 50 amp 125/250 volt use (NEMA 10-50P). - Note: With aluminum wire, use only devices marked CO/ALR.