The 40ft, 6 AWG, 3 conductor UL listed cord has an industry standard NEMA 6-50 Plug and Receptacle, which are what you need for 220-240v 50 amp circuits. The copper is electrical grade so theres only a minimal voltage drop to your machine. The cord has heavy insulation to protect the wiring from chemicals and it is abrasion resistant, so when you drag it around the shop over concrete and through mystery puddles, you know youre still safe.