Help me find this bracket how to build this shelving system

EAI 370mm Twin Slot Wall Mounted Shelving Bracket White Pack of twin slot shelving system Buy Twin Slot Shelving Brackets at Ironmongery Direct Elfa, Altro and More Order by 9pm for Same Day Despatch with Free Returns as twin slot shelving So I'm rather relieved when my husband suggested this twin slot shelf system because I'd never seen them in person before

twin slot shelves Ironmongerydirect does 'elfa' twin slot shelving system