<https://seafrogs.com.hk/products/4-x-8-20-5cm-aluminium-one-inch-ball-ys-head-arm>
<http://schema.org/description>
"Aluminium one inch ball and YS head joint arm section is 8&quot; long and is used to connect various components of flash/strobe/video light system.\nMaterials: Corrosion resistant aluminium allow (hard anodized)\nLength: ﻿8&quot;/20.5cm\nWeight: ﻿3oz/86g\n﻿Ball size: ﻿1&quot;/25mm\n"
<https://seafrogs.com.hk/products/4-x-8-20-5cm-aluminium-one-inch-ball-ys-head-arm>