It supports the boom in all situations preventing accidents in case of bad mistress adjustment, very light, with little exposure to wind and high responsiveness without shocks or adjustments. Fits on all types of masts or booms, whatever their section. The kit is suppliedcomplete for installation as a complement to the existing boom downhaul and consists of:- No. 2 flexible fiberglass rods that have sufficient strength to support the boom and mainsail- Anodized aluminum hooks for attachment to the mast and boom- Stainless steel fastening accessories.The Support has no moving parts and requires no maintenance. Careful finishing preserves sails from damage by friction.Very supple, the support arches under the tension of the sheet or alabass to tension the mainsail to the maximum or, converselyWithout tensioning the antimail, it holds the boom above the horizontal and allows you to let go toincurve the sail, with aft wind, should the need arise.