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 Fiber Technology offers exceptional strength and durability. The open design allows sand and salt to be flushed out easily, keeping maintenance simple. Description Double Footblock (HTX) Size 40MM Work Load 1653 lbs.