Manfrotto Extended Length Lock Knob

SKU:003510
Part #: i504,225EX Extended Length
Part condition: NEW
Substitute part: Replaces R501,225

This part also fits: 577B ver 1, 557B ver 2, 557B ver 2 , 557B ver 3 , 558B ver 1 , 558B ver 2 , 558B ver 3

This knob extends from the 577B bodt about 1 inch more than the usual QR Locking Knob