BACK SHELL KIT INCLUDES: (2) BACK SHELL HALVES (2) 440 THUMBSCREWS (2) HOUSING SCREWS & (2) NUTS (1) SET OF COMPRESSION INSERTS VARIOUS SIZES DIAMETERS: 4mm Smm 7mm 8mm NOTE: POSITION HAS ONLY 1 THUMBSCREW (OPPOSITE CABLE ENTRY) PLASTIC: ABS POLY LAC BLACK UL RECOGNIZED 4-40 THUMBSCREWS: STEEL BLACK OXIDE HOOD SCREWS: STEEL BLACK OXIDE COMPRESSION INSERTS: ABS UL RECOGNIZED NUTS: STEEL STEEL BLACK OXIDE ‘OPERATING TEMP: -55°C TO +110°C Tors COMPLIANT DIMENSIONS {moving} SIZE| AME | Bk coif Dif 9 31.