16Mm Block - Fishingthe 16 Mm Is Harken & Rsquos & Reg Smallest Block The Patented Bearing System Uses Stainless Steel Balls In A Captive Grooved Race And Has A 250 Lb (113 Kg) Maximum Working Load The 404 Uses An O-Ring To Keep The Line In The Sheave During Intermittent Loadingspecifications:Sheave: 16Mm 58Inlength: 29Mm 1-18Inweight: 10G 33Ozmaximum Line: 5Mm 732Inmaximum Working Load: 113Kg 250Lbbreaking Load: 544Kg 1200Lb