Lot of machine-age industrial vintage ceramic insulators w/steel clamps

Lot of assorted old machine-age industrial insulator stand offs with galvanized steel clamping bases. There are three insulators with bases and also an extra steel base. These are made to clamp onto posts, utility poles, antenna masts etc.

Two of these are about 4 1/2" x 5" and the other insulator is about 5 1/2" x 6 1/8". They has age and some old paint.