Package include:10x693zz bearings 10x623zz bearings 10x685zz bearings 10x624zz bearings 10x687zz bearings 10x627zz bearing 10x608zz bearings Crafted from high-quality bearing steel, these deep-groove bearings resist deformation under heavy loads, ensuring long-term reliability.They absorb vibration, reduce noise, and minimize energy loss for efficient, smooth transmission performance. Factory-prelubricated with premium grease for immediate smooth operation.Sealed design locks in lubricant to reduce upkeep needs; reapply grease as needed to extend service life—easy to maintain for hassle-free use. Each bearing features precise inner/outer diameter and thickness (e.g., 3×8×4mm, 7×22×7mm) to fit diverse applications.Avoid the hassle of sourcing individual sizes—this all-in-one kit saves time and effort. Designed for low-demand, low-speed operations (≤200 RPM) with ±0.08mm inner bore tolerance. Perfect for slow-speed transmission equipment, casters, toy vehicles, RC models, and DIY mechanical projects.