Ronstan RF28100 Series 25 Ball Bearing Orbit Block with Becket & Swivel Shackle

The Ronstan RF28100 is a high-performance Series 25 Ball Bearing Orbit Block designed for demanding sailing applications. This single-sheave block features precision ball bearing technology for smooth, efficient operation under load.

Key Features:

• Single sheave ball bearing block with becket hub attachment point
• Swivel shackle head for optimal load alignment and reduced twist
• Ball bearing sheave technology for maximum efficiency and minimal friction
• Ronstan Series 25 design for reliable performance in marine environments
• Compact, lightweight construction with high working load capacity
• Corrosion-resistant materials suitable for saltwater use

The becket hub provides a secure attachment point for additional line control, while the swivel shackle head allows the block to rotate freely under load, preventing line twist and ensuring smooth operation. Ideal for mainsheet systems, travelers, vangs, and other deck-level control systems on sailboats.