A 1-inch grommet specification must identify the dimension being measured; one inch equals 25.4 mm. Check the complete drawing for mounting and passage requirements.
Rubber formulations have different electrical properties. A general grommet should not be described as an absolute electrical barrier or a substitute for the specified cable insulation and protective measures.
Choose the compound for the environment and verify retention after installation. Inspect a removed part before considering reuse and follow the application requirements. For custom manufacture, provide a drawing or existing sample and confirm the dimensions, material and acceptance criteria.
