Type: Deep groove at high speed. rolling element: single breast inside diameter: 17mm Outer Diameter: 26mm Thickness: 5mm Crowd: 10 pieces. Lester: 83g (approx. 2.9 ounces). ). These grooved rodents are made of high quality steel, with low noise and long service life. Rubber seal The deep groove ball bearings with large gear use rubber seals to prevent contamination and save lubricant. p> The inner diameter of the bearing is 17mm, the outer diameter is 26mm, and the thickness is 5mm. They are ideal for small 17mm shaft/rod projects for hobbyists. There are 10 miniature bearings in total that you can use for many different projects.