CKR05-4-100-200 LESTA 100x200mm R600 staircase cross IEK CKR05-4-100-300 LESTA 100x300mm R600 staircase cross IEK CKR05-4-100-500 LESTA 100x500mm R600 staircase cross IEK CKR05-4-055-500 LESTA 55x500mm R600 IEK staircase cross IEK CKR05-4-055-600 LESTA 55x600mm R600 staircase cross IEK CKR05-4-150-500 LESTA 150x500mm R600 staircase cross IEK CKR05-4-055-300 Staircase cross LESTA 55x300mm R600 IEK CKR05-4-055-200 LESTA ladder cross 55x200mm R600 IEK CKR05-4-100-600 LESTA 100x600mm R600 staircase cross IEK CKR05-4-080-300 LESTA 80x300mm R600 ladder cross IEK CKR05-4-100-400 LESTA 100x400mm R600 IEK staircase cross bracket