Universal MATE-N-LOK plug or cap housing strain reliefs and cap housing adaptors. The cap housing adaptors secure the cap housing strain reliefs to the housings to prevent the strain relief halves from “drawing in” when the screws are being torqued down to clamp the cable.
The material for these MATE-N-LOK Strain Relief's is a UL 94V-2 rated Nylon, (for UL 90V-0 rated Nylon see stock number 302-0120 typical).

Strain Reliefs and Cap Housing Adapters must be ordered in pairs

TE Connectivity Universal MATE-N-LOK™ Range