The Remke RD21AA-BKN Dome Cap Cable Gland is crafted from high-quality black polyamide, designed to provide excellent protection for cables with a diameter range of .51 to .71 inches. This PG21 rated gland is ideal for use in various electrical applications, ensuring a secure and weatherproof seal. Its durable construction meets industry standards, making it suitable for both indoor and outdoor environments. The dome cap design allows for easy installation and maintenance, making it a reliable choice for professionals seeking efficiency and safety.