Reduction SKINDICHT® MR-M HEX. 20X1.5/16X1.5+O-RING, reduction, internal thread: M 16, external thread: M 20, nickel-plated brass, , Areas of application: Withstands high chemical and mechanical stress,Suitable for outdoor use,For use with a metric cable gland whose connection thread is smaller than the existing threaded hole, Benefits: Provides flexibility when selecting a cable gland as the selection is independent of the threaded hole of the housing,Mounted O-ring enables a higher protection class (IP) for a cable gland due to the secure seal to the housing,Item numbers ending in 'LF' are lead-free product alternatives with otherwise identical product properties. 'Lead-free' items do not contain lead, which is currently permitted to make up up to four percent in copper alloys, but could be banned in the future according to the RoHS directive,Corrects the size difference between the connection thread of a cable gland and the threaded hole in a housing