300-35 Pulpit Furling Lead. Stainless Steel spring keeps block supported. Delrin(tm) ball bearing sheave ensures low-friction lead for your furling line. Fits 1" (25mm) stanchions. Length 4-11/32" (111mm), Width 1-9/16"(40mm), Safe Working Load 1000 lbs (450kg), Weight 4 oz (113g), Max line size 7/16" (11mm), Sheave diameter 1-7/16" (37mm)