Ronstan Two-speed Mainsheet System Bottom Block Only Drysuits Fishing Gear The key is that the

The key is that the line itself supplies the strength while the shackle simply redirects the force

Screws - 4

Provide movement in all directions and up to 105 degrees either side of center

Wichard 5/16" Eye Nut w/ 21/32" Diameter

Spinlock Double Bulls eye for leading low loaded lines safely

Ronstan Two-speed Mainsheet System Bottom Block Only Drysuits Fishing Gear The key is that theProduct Description Ronstan Two speed Mainsheet System Bottom Block Only Product Information Two speed mainsheet systems allow both coarse and fine tuning in a single purchase system. The system allows fine tuning of the mainsheet when sailing upwind by using one of the sheet tails and keeping the other cleated. Using both the sheets at once allows the trimmer to blow off the main quickly when rounding the top mark and trim on quickly when hardening