The Allen 30mm Dynamic Composite Block with Cheek Hl is designed to be securely fixed to a flat surface. This versatile block is perfect for guiding lines around corners, onto cleats, or along a deck. It is held in place by two screws, one through the middle of the stainless-steel sheave and the other through the countersunk hole in the head of the block. The high load sheave offers faster rolling speeds, higher working loads, and lower friction compared to traditional acetal sheaves. This block can be used with both rope and wire. Additionally, the patented bearing system features twin rows of stainless-steel ball bearings on a stainless-steel rail, providing exceptional load-carrying ability and longevity compared to other plastic rail systems.