... oil and water resistance 2) anti skid 3) dustproof aluminium cover profile slot 8Specification:1) Groove(mm) 8 2) Material: ... Color:red ,blue,yellow,green,silver,blackThe Structure of cover profile . is not vertical angle, it is inward bending, ... press the cover profile into profile groove, this design have guide function, let us have easier installation.aluminium profile aluminium cover profile slot 8