Clear Step Lead Block for 1" StanchionsUnique design leads your furling control line outside of your stanchions for a clean lead aft to the cockpit. Stainless cheeks with Delrin(tm) ball bearing sheave ensure low-friction and high strength. Locks in place with a small set screw accessed through a small hole in the sheave. Specifications:Maximum line diameter 1/2"For 1" StanchionsOverall Width 3-1/8" (79mm)Thickness 1-1/8" (29mm)Safe Working load 750 lbs (350kg)Weight 5oz (142g)