1,OEM/ODM, completable specification 2,Professional factory 3,brass with nickel plated/nylon 4,thread:NPT,M,PG,G 5,CE,RoHS

brass nut of cable connector, cable gland, m12/m14/,,,,,,,m64.

The brass nut part of  the cable gland(cable connector).

Back off nuts, and let the thread part of the cable gland get through the hole of the Steel plate, then tighten the

 nut.