The NAO12x28x12-IS1-XL is a Light Duty Open Type . Single Row Machined Needle Roller Bearing with an Inner Ring. Both the Inner and Outer Ring are easily separable from the Needle Roller Cage and the Inner Ring includes a Lubrication hole. The Needle Roller Cage means that these Bearings have excellent rotational performance and a simple structure with high accuracy. These Bearings are most suitable for mass-production . high running accuracy applications like Machine Tools . Printing Equipment . and Textile Machinery. The bearing dimensions are 12X28X12mm.