Stainless Steel Ball Bearings with Ceramic Balls ABEC-7 quality, this is a popular size that could be used in many application that uses this size 9mm x 17mm x 5mm. Bearings are made of Stainless Steel, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, Ceramic Balls are the highest standard of balls that can make your bearings live at least 5 times more than any other bearings, with ABEC-7 quality, nothing could be better !

• Item: Double Shielded Ball Bearings
• Dimensions: 9*17*5 mm/Metric
• ID (inner diameter)/Bore=9mm
• OD (outer diameter)=17mm
• Width/Height/thickness=5mm
• Equal: 689-2Z & 689-ZZ
• Size: 9mm x 17mm x 5mm
• Type: Deep groove ball bearings
• Material: Stainless Steel
• Balls: Si3N4 Ceramic Balls (Silicon Nitride)
• Closures: 2 Metal Shields
• Lubrication: (Dry)
• Quantity: One Bearing