The 16 mm is Harken'sŪ 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) safe working load - the highest on the market compared to similarly sized blocks.
The 442 uses a spacer and the 404 uses an )-ring to keep the line in the sheave during intermittent loading.
Use for:
Dinghy control lines
Big Boat leech lines
Downhauls
Traveler controls
Spinnaker pole trip lines
Outhauls
Cunninghams
Halyards on prams
The 16 mm is Harken'sŪ smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. 
