CKSQ Aluminum Quick Release Hand Knobs, with Tapped Through Bore | JW Winco Standard Parts
Quick Release Knobs|Quick Release Hand Knobs 6070|Hander Well
Spinner-Knobs - ACE Mobility
Quick-Knob
Acratech Ultimate Ballhead with Quick Release,/Detent Pin, with Left Sided Rubber Main, and Pan Knobs, Supports 25 lbs.: Amazon.co.uk: Electronics & Photo