Jameson JE Extension Poles are equipped with a female ferrule and a male ferrule. Jameson JE Extension Poles, part of the JE Foam Core Series, are preferred for aerial construction and line clearance. Jameson’s original foam core pole is the highest quality fiberglass pole available. The foam core prevents moisture build up inside the pole and adds extra hoop strength and rigidity. Each foam pole has a 1.25” diameter, an .11” wall thickness, and is dielectrically tested to 100KV per foot for five minutes. All ferrules are made of heavy-duty aluminum and have an external leaf spring locking button.