"These bushing bearings are made of high quality aluminum alloy for low noise and long life. Bearings have an inner diameter of 0.79 inches, an outer diameter of 1.54 inches, and a thickness of 0.43 inches. These are great for 0.79-inch shaft/rod projects like 3D printers and engraving machines. They are open blocks, have high speed and high precision. There are a total of 4 bearings that you can use for many different projects."
