16mm Triple BlockThe 16 mm is Harkens smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses stainless steel balls in a captive grooved race.Specifications:Sheave: 16mm / 5/8in.Length: 46mm / 1-13/16in.Weight: 41g / 1.44ozMaximum line: 5mm / 7/32inMaximum working load: 318kg/ 700lbBreaking load: 544kg / 1200lb