The KDSW M20 BS O NI 1 G20S is a cable gland made from brass with a nickel-plated finish. It has an M20 size and meets British Standard (BS) specifications for operational performance in industrial settings, particularly suitable for use in areas where exposure to oil and other non-insolating substances may occur due to its 'O' ring type of sealing that ensures the integrity of the electrical connections it houses.