Found a bunch of these on a long -ago demolished two-pair phone phone circuit, high up in the Colorado Mountains over the summer. I can tell you that they're removal from the wood poles already laying on the ground, took considerable time and effort because each one was secured with three monster, square-head lag bolts around 4" long and the diameter of a man's finger. They make cool coat hangers, I like 'em best showing off a 106 or 160.