These precision-engineered 681ZZ miniature ball bearings are crafted from durable iron with a sleek silver tone finish. Each bearing in this 10-pack features exact dimensions of 1mm inner diameter, 3mm outer diameter, and 1mm thickness, making them perfect for intricate mechanical applications. The open metal design allows for smooth operation and easy maintenance when needed. These micro bearings deliver consistent performance in various miniature mechanisms and DIY projects where precise, small-scale movement is essential. The robust iron construction ensures reliable operation under proper use conditions, while the standardized 681ZZ specification makes them compatible with numerous micro-mechanical applications. Their compact size and professional-grade construction make them ideal for model building, small electronics, and other projects requiring precise, small-scale rotating components. Each bearing is manufactured to tight tolerances to maintain smooth, dependable operation in your miniature assemblies.