Our 30mm Composite Double Cheek Block, part of our Dynamic range, is perfect for applications that require constant sheave movement. Designed to be fixed to a flat surface, these cheek blocks are great for leading lines along a deck, into a cleat, or around corners. They are held in place by two screws, one through the sheave and the other through the countersunk hole in the block's head. Featuring our patented twin row bearing system, our Dynamic Blocks use stainless-steel ball bearings on a stainless-steel rail for superior load-carrying ability and longevity compared to plastic rail systems.