Cape Glass Ltd offers a slim aluminium frame, high performance sliding folding door system called: Boulders Slim 55 Bifold Door System. 

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We can offer fully weather rated, rebated thresholds, flush thresholds, corner sets, pass doors etc.  The system has slim 55mm frame mullions. Its a fully thermally broken aluminium frame, high performance sliding folding door system/. Boulders Slim 55 Bifold Doors have high security multipoint, key locking.