The 16 mm is Harken’s® smallest block. The patented bearing system uses stainless steel balls in a captive grooved race and has a 250 lb (113 kg) maximum working load. The 404 uses an O-ring to keep the line in the sheave during intermittent loading.
Sheave: 16mm / 5/8in.
Length: 29mm / 1-1/8in.
Weight: 10g / .33oz
Maximum line: 5mm / 7/32in
Maximum working load: 113kg/ 250lb
Breaking load: 544kg / 1200lb
Manufacturer : Harken Manufacturer Part No : 404F UPC : 097653285854