Ideal for use with hand-held loads, Lewmar?s Control Blocks feature lightweight, performance loadbearing capacity. MRT (Metal Replacement Technology) and a stainless steel central race and balls provide a weight advantage, while Long Fibre Technology offers exceptional strength and durability. The open design allows sand and salt to be flushed out easily, keeping maintenance simple.Control line applications.Mainsheets for dinghies and keelboats.Spinnaker sheets, barber haulers.Genoa sheets.Dinghy applications.