Heavy duty mast heel plug for the Silver and School Optimist masts

MaterialsAnodized aluminiumWorking load (kg)800Weight (g)5A (mm)8B (mm)10C (mm)12D diameter (mm)25

Formed from high strength steels or stainless steels

Not suitable for use on aluminium craft

Harken® recommends equipping every system with Carbo lead blocks for safe furling from the cockpit

Harken 22mm Upright Block 243 Harken CARBO AIR BLOCKS 57 MM Heavy duty mast heel plugLow friction Micro blocks are compact and lightweight. They are ideal for sailboards, smaller dinghies, and lightly loaded control lines on boats of all sizes. Sheave (mm) 22 mm Sheave (in) 7 8 in Length (mm) 38 mm Length (in) 1 1 2 in Weight (g) 28 g Weight (oz) 1 oz Maximum line (mm) 6 mm Maximum line (in) 1 4 in Fasteners (mm) 5 RH mm Fasteners (in) #10 RH in Maximum working load (kg) 91 kg Maximum working load (lb) 200 lb Breaking load (kg) 544 kg