The ISC Compact Aluminum Arborist Rigging Block (1/2" Rope) RP048 is a lightweight block that fits in the palm of your hand. At approximately half the size of the standard small rigging block, the compact rigging block offers a highly impressive strength to weight ratio. The pulley plates are made from hot forged aluminum, and it is this manufacturing process which allows such a compact pulley to boast such great strength and dynamic load bearing capacity. It is designed to be used with ½” Rigging Lines and is the perfect solution for overhead lowering and lightweight rigging applications. The Spring Lock mechanism allows easy opening for direct connections to rigging slings and the upper sheave connection point eliminates the need for a carabiner in the system.