They are perfect for applications requiring rapid release of ropes, especially when it comes to collapsed the SPI when passing a buoy. - Quick release threads are installed at the outlet of a tap. They include stainless steel wire guides with low friction that keep the cleat away to avoid its accidental blockage during maneuvers. They are perfect for applications requiring rapid release of ropes, especially when it comes to collapsed the SPI when passing a buoy. The Harken wiretops for tracker shuttering are made of robust abrasion-resistant composite materials. The kit includes a CAM-MATIC® micro 468.