Metal Raised Garden Bed Planter Box 105x62x30cm Open Bottom SilverWeather Resistant Material Unlike wood, this planter is made of 0. 6 mm thick, hot dip galvanized metal that won't warp or deform. The mounting screws are attached at the joint and are less likely to get lost. Protected edges The top edge of the planter is protected by a rubber lip to prevent sharp edges from injuring fingers. Open bottom This feature prevents waterlogging and erosion, protects plant roots, and improves nutrient uptake. Modular design