The 16 mm is Harken’s 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 load.
 
Sheave Ø (mm)    16 mm  (in)    5/8 in
Length (mm)    38 mm  (in)    1 1/2 in
Weight (g)    12 g   (oz)    .44 oz
Maximum line Ø (mm)    5 mm   (in)    7/32 in
Maximum working load (kg)    113 kg   (lb)    250 lb
Breaking load (lb)    1200 lb   (kg)    544 kg