To join cable tray parts (DIN 603 M 8x20 ISO 8677). Never use this screw to fix the cable tray to a vertical support. In installations subject to vibration, metal screws with blocking nuts must be used. Colour: Grey RAL 7038. Insulating material, halogen free. Safe, easy and quick mounting. Halogen-free product made of 100% recycled thermoplastic component.