Review on 🔧 770pcs Rubber O Ring Assortment Kits 18 Sizes Nitrile Rubber NBR Sealing Gasket Washers by HongWay - Ideal for Car, Auto, Vehicle Repair, Plumbing, Air or Gas Connections - Professional Quality by Paul Wilson

These o-rings are measured as the outside x-section (cord diameter), not the inside x-section. O-rings are commonly measured as inner diameter x cross section. That's why O-rings are so small. All other o-ring kits I've checked have 18 sizes that fit this kit and have an ID (internal diameter). So be careful as they are very small as their size is measured by the outside diameter. You would think the seller would note this in their specs. O-rings are overpriced due to their small size. Another set of o-rings I have, with the exact same dimensions in their chart, only had two of the same o-rings. For example: This kit (OD x CS) has 9x2 and 10x2 o-rings, same as 5x2 and 6x2 in my current kit which is measured as ID x CS.