The Laser Block Ratchet Spring is to hold your ratchet upright, the spring is heavy duty.Replacement stainless steel spring to suit stand up blocks such as the Laser Harken 57 mm Carbo Rachet Block (LS-91333).Laser/ILCA mainsheet block spring for the Laser or ILCA sailing dinghy which holds the block up straight and in place.This spring sits underneath the block on top of the lacing eye.SpecificationSize: Large