Porcelain Cleat Insulators

These insulators are typically used for indoor or underground wiring.  There are a great variety of cleats, and these date back into the late 1880's.  The most common style is a two part insulator where the sections clamp one or more wires and are mounted with nails or screws to wood.

Here is an example cleat for a single large cable.

Here is a smaller style complete with screw mounts

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