Designed for cell phone accessories. Both threads are 0.75mm pitch.
13mm - 28mm Filter Adapter Ring Adaptor Ring Step Up 13mm-28mm
17mm - 37mm Filter Adapter Ring Adaptor Ring Step Up 17mm-37mm
CD Slot Mount for CarPlay Screen 360° Rotation 17mm Ball Adapter GPS Mount 4
BMW E46 3 Series 17mm Dashboard Ball Mount And MagSafe Adapter - RHD & LHD
Universal Ball Head Mount Base 17mm Ball Head to 1/4inch Male Adapter with Screw
