ITEM NAME:2Pcs Dual Joint Ball Extend Arm Extension Diving Underwater Photography Tool Description: - Material: Aluminum alloy, high strength, corrosion resistance - Length: 6"/ 15.24cm - Ball Diameter: 2.54cm/ 1inch - Lightweight and highly durable - For connecting strobe/video light to underwater housing - High flexible changing joint, adjustable bracket Package Included: 2 Pieces 6" Dual Ball Joint Arm.For connecting strobe/video light to underwater housing. 2 Pieces 6" Dual Ball Joint Arm. - High flexible changing joint, adjustable bracket. - Material: Aluminum alloy, high strength, corrosion resistance.