500-35 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) - 1-1/4" (32mm) stanchions. Delrin Ball Bearing Sheaves diameter 2" (51mm), Length 4-3/4" (145mm), Width 1-1/8" (29mm), Maximum Line = 1/2" (12mm), Safe Working Load 1200 lbs(544kg).