Features Steel Construction: Crafted from high-quality steel, these bearings offer low noise and a long service life, ensuring durability and reliability for your projects. Double Shielded Design: The double shielded feature prevents contaminants from entering and conserves lubricant, enhancing the bearings' efficiency and performance. Dimensions: With a 15mm inner diameter, 21mm outer diameter, and 4mm thickness, these bearings are engineered to fit small hobby 15mm shaft/rod projects accurately. Versatile Application: Ideal for small hobby projects, these bearings are suitable for a wide range of applications, offering flexibility and convenience for various projects. Value Pack: This pack includes 10 pieces of miniature bearings, providing ample supply for multiple projects, making it a cost-effective solution for your needs. Features: 1、These bearings are made of steel for low noise and long service life. 2、They are double shielded to avoid contaminants entering and save lubricant. 3、Bearings have a 15mm inner diameter, a 21mm outer diameter, and a 4mm thickness. 4、These are great for small hobby 15mm shaft/rod projects. 5、There comes total 10 pieces miniature bearings which you may use for many different projects. Specification: Features: These bearings are made of steel for low noise and long service life. They are double shielded to avoid contaminants entering and save lubricant. Bearings have a 15mm inner diameter, a 21mm outer diameter, and a 4mm thickness. These are great for small hobby 15mm shaft/rod projects. There comes total 10 pieces miniature bearings which you may use for many different projects. Specification: Model: 6702ZZ Material: High-carbon chromium bearing steel Type: Deep-groove high-speed Rolling Element: Single row Inner Diameter: 15mm / 0.6in Outer Diameter: 21mm / 0.8in Thickness: 4mm / 0.2in Quantity: 10pcs Weight: 33g / 1.2oz(approx.) Package list: 10 * Bearings Package List