... applications. 2.Rubber hole stoppers are perfect to cover holes in a variety of objects. Generally, these rubber stopperss are used ... used for applications requiring resistance to heat and chemicals. 3.Available in various shapes and sizes, rubber hole plugs can be custom made as ... as well as medical applications where sterilization is needed 5.Available material:silicone,EPDM,FKM,SBR,NBR,NR,CR,IIR,etc ...