1, Anti-slip 2, Anti-rust 3, Strong steel structure 4, Ventilation, lighting, durable 5, Fastest delivery ... , walkways,trench gratings, and stair treads. Wuxi Wellter Metallic Products Co.,Ltd is one of the largest steel grating manufacturer in China ... , easy to installation and durable for uses.Steel grating products are designed and manufactured for various industrial and civil constructions ...