6806ZZNR Bearing 30x42x7 Shielded Snap RingBall Bearings 30x42x7 Chrome Steel With Snap Ring (C clip) 6806ZZNR Ball Bearings with Snap Ring (C clip), this is a popular size that could be used in any application that uses this size 30mm x 42mm x 7mm. Made from high strength chrome steel for durability and performance and can rotate up to 15,000 rpm, each Comes with double metal shields (ZZ) to keep out dust and dirt, additionally, these bearings come pre lubricated with grease for smooth