The Allen 30mm Dynamic Flip Flop Block with A..77 Cleat features a ball bearing sheave and an aluminium cam cleat. It is designed to pivot around a central fixing point, keeping the rope close to the deck, mast, or boom while also allowing for the correct lead angle. This results in low friction and efficient guiding of the rope. The relocatable sheave has two installation options, providing versatility for a wider range of applications. The sheave also utilizes dynamic ball bearing technology for superior load-carrying ability and longevity. Additionally, the block can be easily removed and disassembled for maintenance or installation purposes. The included A..77 small ball bearing cam cleat has a jaw profile optimized for rope entry and exit, reducing wear on the rope. Double coil springs and ball bearings ensure a smooth and consistent cleating action. This versatile block is ideal for halyards, pole launchers, and control lines. Please note that the large version of the backing plate