The Ronstan 20 mm Series 20 Upright Lead Block (RF20171) has self-lubricating Acetal polymer sheaves running on polished stainless steel races that perform equally well with dynamic loads and high static loads.
- Low friction
- High static and dynamic load capacity
- Stainless steel ball bearings
- UV stabilished Acetal sheave
- Grade 316 stainless steel load housing
- Impact and UV resistant, stainless steel cheeks
- Typically used for halyards at the mast base