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Description Armstrong's black main runners have a clean, sleek finish and a bulb design, which boosts the strength and longevity of the ceiling system while providing a stylish appeal. These sturdy main runners include a 'Superlock Clip,' which secures the main runner and ensures exact alignment of the ceiling grid, as proven by an audible click. With a hot-dipped galvanised steel covering for added protection and corrosion resistance. The main runner is simple to cut and use, with slots at 100mm intervals for more versatility. Featuring a staked-on stab-end clip detail and joggled at either end for simple removal and relocation. Features & Benefits Galvanised steel Joggled end 100mm slots