Our 20mm Dynamic Composite Cheek Block is the top choice for constant sheave movement in various applications. These cheek blocks can easily be affixed to a flat surface, making them perfect for leading lines around decks, into cleats, or around corners. Two screws are required for installation, one through the sheave and another through the countersunk hole in the block's head. Our patented bearing system, featuring twin rows of stainless-steel ball bearings on a stainless-steel rail, provides unmatched strength and durability compared to other systems that use a plastic rail.