Ideal For Use With Hand-Held Loads, Lewmar’S Control Blocks Feature Lightweight, Performance Load-Bearing 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.