The Super Spike 38mm (for 1 inch pole) is a multi purpose ground spike which adds significant stability. It is designed for use with 38mm (1.50 inch) diameter pole or .50 inch NPS thread. Supplied with two snap in adapters and is constructed of UV black polycarbonate. Sufficient space is allowed for a cable connection under the dome. Suitable for use with aluminum, copper and 316 stainless steel luminaires. Fixture sold separately.