Harken 404 16mm Single Air Block. The 16mm 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 113 kg maximum working load. The 404 uses an O-ring to keep the line in the sheave during intermittent loading.

• Sheave diamete:r 16mm
• Length: 29mm
• Weight: 10g
• Maximum line diameter: 5mm
• Maximum working load: 113kg
• Breaking load: 544kg