This 11-piece transition edge kit finishes the outer border of interlocking drainage mat installations, covering exposed edges for a clean, professional look in garages, restaurants, pool decks, and other wet-area floors. Molded from wear-resistant, dampproof polypropylene, the straight edge pieces resist corrosion and keep their shape instead of cracking or warping under regular foot traffic. Each piece presses onto the mat direction and locks into place without tools, so finishing a room's perimeter takes only a few minutes. A smooth transition design reduces the height difference at the mat's edge, cutting down on tripping hazards while still letting water and debris pass through the open-grid structure underneath for easy rinsing and cleanup. This black edge kit is designed specifically to pair with interlocking drainage mats and is not intended for use with other flooring systems.