Tii-Shackles also known as soft shackles are a great replacement for heavy metal shackles. Tii-shackles are available in different lengths and diameters to suit our range of Tii-On blocks. Tii-shackles can also be used in a variety of other applications and with many different products such as the Pad-Tii range. Tii-Shackles are reliable, strong, and easy to use. Simply feed the knot through the end loop and pull tight. Once tight the shackle cannot be undone until pressure is released and the loop manually threaded loose.