Series 30 High Load Block, Loop Top Single, Loop Head - Ronstan

The Ronstan RF20151A is a Series 20 rivet-mount cheek block designed for high-efficiency control systems on dinghies, catamarans and small keelboats. Its reinforced nylon cheeks with a 316 stainless steel load strap provide excellent durability and long-term strength, while the dual-race ball-bearing sheave ensures exceptionally low friction and smooth operation under load.
The compact mounting footprint makes it ideal for direct installation on deck or mast bases for vang, cunningham, barber haulers or fine-tune control lines.
Specifications: 20 mm sheave, max rope Ø6 mm, MWL 250 kg, breaking load 550 kg, weight 20 g. A lightweight yet robust solution for sailors seeking reliable performance in a minimal space.