Harken 16 mm Narrow Block Bronze SheaveThe 16 mm is Harken 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 and has a 250 lb (113 kg) maximum working loadthe highest on the market compared to similarly sized blocks. The 467 and 484 use a narrow sheave for extremely small control lines and have a ferrule head for soft attachments. They use the same high load ball