Drainage grates, aka drainage covers, are vital for drainage systems. Made of metals (e.g., stainless steel) or plastics/composites. Flat steel is 3 - 10mm thick; center spacing varies. Standard sizes exist and can be customized. They have light (25t/㎡), medium (70t/㎡), heavy (140t/㎡) load types. High drainage efficiency with 83.3% leakage area. Anti-slip surface ensures safety (friction ≥0.6).
