ドリキンさんのスマホホルダーはこれのはずです。

Sirui TSH-01B Table Tripod w/ Ball Head, Cell Phone Grip, Selfie Stick, Bluetooth Trigger
https://www.amazon.com/gp/product/B076MCN2T8/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1