1601-ZZ, Inch Dimension Deep Groove Radial Ball Bearing, 3/16" I.D. x 11/16" O.D. x 1/4" inch Wide, Double Shielded, Made of Chrome Steel with chrome steel balls and steel cage,bearing is closed with Metal Shields to protect the bearing from contamination. The bearings are Shielded and Pre-lubricated, the quality is set to EMQ (electric motor quality) to ensure high speed service Lubricated with Polyrex grease. Dynamic load rating: 491 Lbs., Static load rating: 194 Lbs 
Precision ground bearings designed to be interchangeable with traditional semi-ground inch series bearings. These ABEC-1 tolerance bearings have precision ground deep-groove races on both the inner ring and outer ring, which enables them to sustain moderate axial loads as well as high radial loads. Balls are separated by a pressed steel cage. 

These bearings meet or exceed the current and published ABEC-1 standards for dimensional tolerance, speed rating and load capacity.