Radio Box Water Seal Boots for 4-40 sized linkage rods Features: Seals are constructed of rubber, purple in color Includes: Three Radio Box Water Seal Boots **4-40 linkage rod in picture not included** Requires: Drilling holes in radio box and gluing seals into place with CA glue Specs: Seals; Exits; Length: .708" (18mm); .551" (13mm) Diameter: .748" (19mm); .137" (3.5mm)