Ronstan RF51210 50mm Double Block with Becket | Series 50 PulleyThe Ronstan RF51210 is a high performance 50mm double block with becket, designed for multi line control systems on dinghies, keelboats, and small yachts. The integrated becket allows for tie off or dead end in a purchase system, increasing versatility in your rigging setup. Part of the Ronstan Series 50, this block features twin UV resistant acetal sheaves and 316 stainless steel cheeks, ensuring smooth operation, high durability, and long term

Ideal for kayaks

✅ Fully sealed and IP67 waterproof rated

this block features three 20mm acetal sheaves running on precision stainless steel or Torlon® ball bearings

it’s a go-to choice for Kiwi boaties who demand quality and durability

low-friction performance

marina berths

Weight 22 g

this indicator delivers crisp

it’s ideal for boating

Featuring a bright red light for the port (left) side and green for the starboard (right)

and marine-grade tinned wiring

offshore readiness