Harken 16mm Hook-In Halyard Block 391 Ronstan FRICTION RINGS All Optiparts boom end fittings

All Optiparts boom end fittings are made of high quality glass fibre filled nylon and have a firm grip around the mast to ensure the mast and boom always turn together

Manufactured by the same manufacturer as the genuine OEM

The best way to inflate a fender is pushing air pressure from a compressor with a flat head against the valve and the fender will inflate

Height (in) 15/16 in Length (in) 1 7/8 in Length (mm) 48 mm Width (mm) 24 mm Width (in) 15/16 in Weight (g) 8 g Weight (oz)

Harken 16mm Hook-In Halyard Block 391 Ronstan FRICTION RINGS All Optiparts boom end fittingsThe Harken 391 16 mm is Harkens 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 (mm) 16 mm Sheave (in) 5 8 in Length (mm) 41 mm Length (in) 1 5 8 in Weight (g) 13 g Weight (oz) . 5 oz Maximum line (mm) 5 mm Maximum line (in) 7 32 in Maximum working load (kg) 113 kg Maximum