The Super Spike is a multi purpose ground spike which adds significant stability when used in loose or sandy soil. It is designed for use with .50 inch NPS luminaires and any pole lite style luminaire, and is supplied with two snap in adapters for use with both. 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. Dimensions: 3.25 inch diameter x 12 inch length spike x 4.38 inch diameter x 1.63 inch height dome. Fixture sold separately.