lot of 4 vintage porcelain insulator standoffs for radio antennas etc.

Lot of four vintage old stand-offs with white porcelain insulators for electrical wiring, radio and television antenna cabling etc. They are from the estate of and electrical engineer and short wave radio buff. These measure 3" long and about 1 3/8" across the outside of the standoff and about 5/8" across the inner diameter of the porcelain insulator.