The Harken 3/4" Max Line Size Rigging Pulley IN166 is a durable and high-quality pulley designed for outdoor sports and activities such as climbing and caving. With a maximum line size of 3/4" and a design factor of 5:1, this pulley is capable of handling a maximum load of 17,500lb. The Harken brand is known for producing reliable and long-lasting rigging hardware, making this pulley a dependable choice for outdoor enthusiasts.