The Allen 30mm Dynamic Flip Flop Block with A.677 Cleat includes a versatile design that allows for proper lead angle while minimizing friction. It features a removable sheave with two installation options, dynamic ball bearing technology for superior load-carrying ability, and a clevis pin that can be easily removed for access to the backing plate. The block also comes with an Allenite cam cleat that offers a lightweight and durable alternative to standard acetals. This product is perfect for lower loading applications such as halyards, pole launchers, and jib sheets. For more detailed dimensions, please refer to the accompanying PDF.