These are great for small hobby 8mm shaft/rod projects such as 3D printer, engraving machine
They are double sealed to avoid contaminants entering and save lubricant
Bearings have a 8mm inner diameter, a 15mm outer diameter, and a 45mm length
There comes total 6 pieces bearings which you may use for many different projects
These liner-motion bearings are made of high quality bearing steel for low noise and long service life