The Allen 30mm Dynamic Fork Block is perfect for applications that require consistent sheave movement. This block includes a removable clevis pin, making it extremely easy to attach. It also features a patented bearing system with twin rows of stainless-steel ball bearings on a stainless-steel rail for superior load-carrying ability and durability compared to other bearing systems on plastic rails. Additionally, the 20 & 30mm blocks have a central rivet for reduced weight and a rope-friendly attachment, making it a great choice for use in a cascade system.