The Harken 40mm Carbo T2 Loop Block features a high-strength composite construction that eliminates the need for heavy metal shackles or rivets. This lightweight design makes it perfect for applications where minimizing weight is crucial, such as traveler controls, mainsheets and various control line systems on smaller boats. The T2™ has a "on/off" loop system. The loop, made from ultra-strong and lightweight SK75 Dyneema® fiber, slides smoothly through the block head and over a secure anchor post, creating a dependable connection.