Single sheave stand-up block with saddle & spring included VERSATILITY THROUGH STRENGTH The new Series 40 ball bearing Orbit Blocks™ provide the perfect balance of strength, performance, and reliability. They offer class-leading dynamic and static load ratings, the highest available in this size of performance blocks. Lightweight and strong toughened glass fibre reinforced nylon cheeks replace stainless steel straps used in traditional utility blocks - the perfect balance of performance and reliability. As well as traditional single swivel blocks, the range also includes single and double sheave lashing or soft attachment options through to multiple sheave blocks including those with quad and quin sheaves. The range is extremely versatile allowing a multitude of possible systems right up to a 12:1 purchase mainsheet system for off-the-beach performance catamarans. Ball Bearing versions incorporate our 2-stage bearing system using ball bearings to minimise friction and a secondary full-contact bearing to maintain low friction across the full working load range. Stainless steel shackle head for unlimited block rotation, and compatibility with sharp fixing points. Spring and saddle included. Fastener Ø: 5mm, Fastener Hole Centres: 36mm Applications: Mainsheet systems and spinnaker sheets on dinghies, off-the-beach catamarans and sportsboats to 8m (26ft). Halyard, vang, and backstay applications on boats to 8m (26ft). Control line applications on larger yachts. Materials: BB Sheave and balls: High compression strength acetal. Frame/cheeks: Toughened, glass fibre reinforced nylon. Head fittings and hubs: Grade 316 stainless steel.