High-Precision Micro-Hole Aluminum Gutter Filters For Fast Water Permeation Description: Our heavy-duty aluminum gutter leaf filter adopts industrial precision micro-hole stamping technology, with uniform, smooth and orderly hole distribution, realizing the perfect balance of efficient debris blocking and rapid rainwater penetration. The scientifically calculated micro-hole diameter can accurately block various solid debris such as fallen leaves, pine needles, twigs, roof