I recently purchased this pack of rubber hole plugs for my industrial machinery and it has been a great investment. The assortment of diameters allowed me to quickly find the perfect fit for each hole, providing a tight seal against any debris or contaminants... The material is durable and built to last ensuring my equipment stays protected and functioning efficiently. The only downside is that the pack doesn't come with more plugs in larger sizes. Overall, a valuable addition to any Industrial and Scientific hardware collection..