The Allen 20mm Tie On Dynamic Block comes equipped with a strong and reliable stainless-steel head loop, ensuring proper orientation during use. This option also includes a soft shackle, though it can be purchased without one. The large central rivet reduces weight and offers a rope-friendly attachment, making it perfect for use in a cascade system. Featuring our patented bearing system with twin rows of stainless-steel ball bearings on a steel rail, this block is designed for superior load-carrying and longevity compared to plastic rail systems. Follow the provided fitting instructions carefully to ensure maximum strength, such as feeding the rope through the central axle and head of the block. For best results, attach with a crossed or threaded line, as this keeps the side cheeks tightly together. When using a Tii-Shackle, cross the lines if possible. For further fitting guidance, please contact us.