Galaxy Style 5228-1, 1 ft Heavy-Duty Extension MastOne foot length. Constructed of high-quality Shakespeare white fiberglass, and finished to match Galaxy antennas. This 1 " diameter extension mast can be used to increase height of an antenna and thus improve effective range, or to boost placement of an antenna above on-board obstructions. For light to moderate applications. Excellent for use with GPS or TV antennas to clear on-board obstructions. Stainless steel upper and lower ferrules with standard 1in-14 thread Mount: Shakespeare Style 409-R or 410-R Mounting Kit (sold seperately) One section, actual length 12" Use an upper support bracket (sold seperately) if the length of antenna and mast total more than eight feet.Color: Galaxy White Specifications: Color: White Construction: Fiberglass Ferrule Type: Stainless Steel Length (Inches): 12" Box Dimensions: 2"H x 2"W x 18"L WT: 1.1 lbs UPC: 719441200145 Quick Guide (pdf)