Top Entry D-Sub Backshells available in 4 industry sizes/positions: Standard (9, 15, 25, 37) or High Density (15, 26, 44, 62) Thumbscrews supplied with backshell. More robust design for those areas that need it. Fully tapped assembly holes allow easy assembly keeping manufacturing cost down. 2 pc. grommet with various I.D.s included. Perimeter sealing lips for secure assembly. Also available in Metalized plastic and plastic versions. Die Cast: Lightweight Zinc Plating: Nickel over copper Metalized Plastic: High temperature plastic Plastic: High temperature plastic Hardware: Steel with nickel