Flame retardant thermoplastic. Two side cable knockouts and one 25mm base knockout. Need to fit a single socket into a plasterboard wall or ceiling? This 1 gang dry lining box is so easy to work with - it comes with two side cable entry points and a 25mm base knockout, along with adjustable lugs for a simple installation. The lugs have large bearing faces for superior strength, and combine with a flame-retardant thermoplastic construction to make this a tough and durable plasterboard back box. Suitable for fitting board thicknesses from 6.35mm to 15mm. 1 gang dry lining box with internal depth of 47mm. 25mm base knockout and two side cable entry points. Made from flame-retardant thermoplastic for durability. Yellow nylon lugs with large bearing faces for superior strength. Lugs are adjustable for straightforward installation. Suitable for fitting board thicknesses from 6.35mm to 15mm. White, plastic dry lining boxes. For mounting electrics into dryline cavity walls. Ideal for fitting into plasterboard walls / panels etc.