Ronstan RF188 Series 29 Utility Single Block with Becket and Rivet Eye

The Ronstan RF188 is a lightweight, economical 29mm utility block designed for small to moderate control line applications on sailboats and dinghies. Built with quality materials and a simple, reliable design, this single block with becket and rivet eye delivers dependable performance without the complexity of bearing systems.

Premium Construction:

• 316 stainless steel cheeks provide exceptional strength and superior corrosion resistance in marine environments
• UV-stable acetal sheave resists sun degradation for extended service life
• Riveted construction ensures durability with virtually no maintenance required
• Hollow rivets allow flexible mounting options and function as an integrated becket for additional purchase

Versatile Applications:

• Backstay tensioning systems
• Cunningham controls
• Internal outhauls
• Boom vangs
• Halyard tuning on dinghies
• General light to moderate load control lines

Specifications:

• Sheave diameter: 29mm
• Line compatibility: 5/16" (8mm) rope
• Attachment: Rivet eye (works with shackles, fasteners, or lashing)
• Includes integrated becket for extra purchase

This workhorse block requires only an occasional freshwater rinse to maintain peak performance. The rivet eye design works best when paired with a shackle (sold separately) for secure attachment to your rigging system.