Name: Hole Plugs / GrommetMaterial: Silicone Rubber (Flexible, Food Grade)Hardness: 50°Temperature resistance: -40℃ ~250℃Color: If you wish different colors, please touch customer service.Features: corrosion resistance, acid and alkali resistance, extreme temperature resistance 250℃, UV resistance, getting old resistance, long carrier life, excessive and low temperature resistance, etc.Role: Used for threading and plugging holes, spray platingSize description: the dimensions is the size of A in the figureHow to make your mind up the size: A size is the size of the small plug of the rubber plug within the hole. When deciding on the rubber plug, attempt to favor a size that is one length greater than the actual dimension hole. Only in this approach can the sealing impact be carried out with out falling off.Package Include: According in your Choose!