5 Series Triple Over the Top Block. Stainless Steel cage and base provide a solid platform for clean leads. Delrin(tm) ball bearing sheaves ensure low-friction and high safe working loads. Sheave Diameter 2" (51mm), Max line size 7/16"(11mm), Length 2-7/8"(73mm), Width 3-17/32" (90mm), Height 2-15/16" (74mm), Bearing Height 2" (51mm), Fasteners (6) #10 RH (5mm), C/C 2-5/16" (59mm), Safe Working Load 1000 lbs (450kg), Weight 1lb 1 oz (482)