The Allen 30mm Tie On Double Block with Soft Shackle is a reliable and strong option for any sailing needs. With a stainless-steel head loop, this block stays securely in place, even with heavy loads. For maximum strength, follow the correct attachment method by feeding the rope around the central axle and through the head of the block. When possible, attach double blocks with crossed/through threaded lines for optimal load distribution. The large central rivet and patented bearing system provide superior durability and performance. Choose from a variety of options, including a Tii-Shackle (soft shackle) or without. Contact us for further fitting advice.