Designed for clock repair, these round hole brass washers are crafted from high-density brass for exceptional strength and corrosion resistance, ideal for long-term use in precision mechanics. The set includes multiple sizes (1mm-5mm inner diameter) to flexibly fit screws, shafts, and gear components, resolving loosening issues caused by size mismatches. Each washer features finely polished edges to prevent surface scratches on delicate parts. Perfect for professional horology or DIY tool maintenance. The transparent storage case ensures organized access and improved workflow efficiency.