<h2>Basic Info.</h2> <table> <tr><td>Inner Diameter</td><td>16 mm</td></tr> <tr><td>Outer Diameter</td><td>21 mm</td></tr> <tr><td>Thickness</td><td>10 mm</td></tr> <tr><td>Type</td><td>Needle Roller Bearing, Closed, Without Outer/Inner Ring</td></tr> <tr><td>Material</td><td>Bearing Steel</td></tr> <tr><td>Lubrication</td><td>Grease or Oil</td></tr> </table> <p>High-precision needle roller bearing (models K16X21X10 etc.) designed for radial load applications. Made of premium bearing steel, available in P0–P2 precision grades and C0–C4 clearances. Compact 16×21×10 mm size, OEM/ODM supported, shipped from China.</p>