Leviton 2310-B 20-Amp, 125-Volt, Flush Mounting Locking Receptacle, Industrial Grade, Grounding, All Black, Black Super Tough Nylon Body Resists Damage from Severe Impact, Abrasion and Chemicals UL 94 V-O Flammability Rating, The Best Rating of any Material Used in Industrial Locking Flush Receptacles Available Today Extra-Thick .050-Inch Nickel-Plated Brass Mounting Strap for High-Abuse Applications Designed for Maximum Durability: One-Piece .040-Inch Brass, High Copper-Content Contacts with Nickel-Plated Clamp-Type Terminals Color-Coded Voltage Rating on Face for Easy Identification