16mm Double Block with BecketThe 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 / 5/8inLength: 54mm / 2-1/8inWeight: 28g / 1ozMaximum line: 5mm / 7/32inMaximum working load: 204kg/ 450lbBreaking load: 544kg / 1200lb