Miniature Deep Groove Ball Bearings for Nail Machines – Precision P5 grade, ultra-low noise ≤20dB, speeds up to 50,000 RPM. Low vibration, low temperature rise, smooth rotation. Pre-lubricated and ready to install. Perfect for electric nail files, nail printers, manicure drills, and beauty handpieces where quiet, comfortable, and reliable performance matters most. Dimensions: 3×8×4mm, 3×10×4mm, 6×10×3mm, 8×14×4mm. Material: Chrome Steel / Stainless Steel Grease Speed Limit: 40,000+ RPM Seal Type: ZZ (metal shield) Precision Grade: P5 Noise Level: ≤20 dB