The Harken 57 mm Carbo FiddleBlock line
features the Cam-Lock locking system. The patented switch allows the jaw
to lock at 90-degree interavls, or to swivel freely. The Harken Carbo Fiddle
line features high-load ball bearings with fitted races for low-friction
The Harken 57 mm Carbo Fiddle Ratchet Blocks provide precise on/off control
with accessible, easy-to-operate on/off switches on both sides of the block.