The 3.5" Swivel Hook Block Double Sheave with a 5/16" groove from Block Division Inc is designed for optimal performance in lifting applications. This block features a double sheave configuration, which enhances load distribution and reduces strain on ropes. The swivel hook allows for 360-degree rotation, preventing tangling and ensuring smooth operation. With a 3.5-inch diameter and a 5/16" groove, it is compatible with a variety of rope sizes. Built from durable materials, this block is ideal for use in construction, rigging, and industrial settings, meeting stringent safety standards for reliable performance.