8x400. TROX40. 50. 8,48. The Great screws for barns, pole buildings, sheds, wood fences, docks, airplane hangers, and much more! the self-drilling tip allows you to apply less torque and still drive these huge lags home. The star drive torx heads allow you to drive this lag screw with much less downward pressure than otherwise would be needed.Chipboard Flooring with tongue and groove joints are designed to be easily installed and are also moisture resistant. These Chipboard Floorboardse in two sheets sizes, 18mm X 2400mm X 600mm Chipboard Flooring and 22mm X 2400mm X 600mm. It is easily slotted together using tongue and groove joints (t&g).Particle board has more screw holding capa aspared to MDF, so it is widely used to make furniture which can be assembled using screws. It requires minimal maintece and is easy to clean. Particle boards have thermo-acoustic insulation properties, so they are very much useful in speakers and in false ceiling of auditoriums, theaters, etc.Chipboard screws have a coarse thread and fine shank to provide maximum grip and minimum stripout. Specially designed to drive easily into Particle Board, MDF Board, Plywood and Soft timbers. Suitable for all industries manufacturing, cabinets, furniture, kitchens, office partitioning, wood packing boxes etc. Available from 3mm -6mm thickness.