1)OEM/ODM, completable specification 2)brass with nickel plated 3)NPT,Metric,PG,G 4)custom designs are acceptable brass nutbrass nut of cable connector (cable gland), m12/m14/,,,,,,,m64.The brass nut is 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.