The Harken 57mm Carbo Ratchamatic Flip Flop Block w/cam is a block with a system that allows for free movement of the line under low loads. However, as loads increase, the Ratchamatic® automatically engages a ratchet mechanism, providing a reliable holding power of up to 15:1. This feature is particularly beneficial for situations requiring temporary line security during sail adjustments or maneuvers. his block also features a cam cleat