ITEM NAME:Ball Adapter w/ Screw for Underwater Camera Diving Photography System Black Description: Lightweight, strong and durable. 360 degrees rotation. Ball base for underwater dive camera / video housing arm system. Multiple articulation and adjustment points for perfect viewing angles Ball design dampens shock and vibration helping to extend the life of your camera. Size: Approx. Ball Head Length: 54 mm / 2.12 inch Ball Head Dia: 25 mm / 0.98 inch Long Screw: 58 mm / 2.28 inch Short Screw: 44 mm / 1.73 inch Material: ABS Plastic Package Includes: 1 Piece Diving Ball Head with Screw Note: 1.Please allow 1~3 cm error due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you..1 Piece Diving Ball Head with Screw. People always bought together with.