The Allen Standard 40mm Switchable Ratchet Block is expertly designed to provide versatility and convenience for a seamless sailing experience. Its innovative switchable ratchet mechanism allows you to easily turn it on and off, even while under load, making it perfect for use with dinghy spinnaker sheets or jib sheets. The lightweight and compact block weighing only 40mm is a must-have for any sailing enthusiast looking for top-quality equipment.