Concrete lintels are called pre-stressed supplied by Stressline in three sizes in various lengths. The sizes are 100x65mm, 150x65mm and 140x100mm starting at 600mm and going up in 300mm increments.Metal lintels are supplied by Keystone and they come in many different dimensions for various requirements. We carry in stock cavity lintels to suit cavity sizes 50mm 70mm and 90mm with either 100mm leaves both sides or 100mm outer and 125mm inner in various lengths.Box lintels in 100mm and 150mm in various lengths. We only keep all lintels to a standard load bearing.Keystone are the market leader in special shape lintels offering a fast and professional Delivery service.We are unable to recommend what type of lintel you require as load bearings from plans have to be calculated to obtain correct duty is required. This service is offered no cost from keystones Technical department a copy of your plans will be required and posted from our sales office. This will Guarantee that the correct lintel is specified so that failure will not occur.