<https://seafrogs.com.hk/products/4-x-8-20-5cm-aluminium-one-inch-ball-ys-head-arm>
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"4 x 8&quot;/20.5cm Aluminium one inch ball &amp; YS head arm"
<https://seafrogs.com.hk/products/4-x-8-20-5cm-aluminium-one-inch-ball-ys-head-arm>