The Reversible (R) units are precision engineered with quality components and materials. The R units are semi-frameless enclosures with aluminum on the hinge. The strike side will latch with either a mag handle, a mag towel bar, a thru-the-glass pull handle and mag clamp. Unlike the CDM type of doors the (R) uses a plastic drip rail or sweep "P14WS". This drip rail is removable or can be replaced at your discretion. The aluminum is of a thicker gauge, providing a higher quality hinge than industry standard. Also, the shape of the hinge has a slight taper, giving the feeling of Euro style.