20mm: ball head aperture 20mm, bottom screw hole M20, height about 102mm. Female Rod End, Bearing Rose Joint, Right Hand Thread 5,6,8,10,12,14,16,18,20mm. 【Specification】: 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm.
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