Lot of 6 - bed frame or table adjustable legs. The adjust from 7-7/8" to 9" tall, they have 10mm X 1.5 threaded studs sticking up 3/4" (19mm) at the top. They are steel, but the 3-3/4" diameter bases are plastic. Tube diameter is 1-11/16". I ship USPS/FedEx or UPS with delivery confirmation, these will be economy ground freight.