Helffer Double Pulley Block (35mm / 50mm), Silent Reinforced Nylon Twin Wheels & 316 Stainless Steel Hardware, Heavy Duty Fixed Eye Rigging Roller for Block and Tackle, Kayak Anchor & Awning

Helffer Composite Double Pulley: The Rust-Proof Lightweight Solution. Traditional all-metal pulleys are heavy, can rust, and might scratch your expensive equipment. The Helffer Series solves this by combining the best of two worlds: the structural strength of 316 Stainless Steel hardware with the lightweight durability of a Reinforced Nylon Body. Why choose this Hybrid Nylon/316 Steel design? 100% Corrosion Resistance: The body is plastic (won't rust), and the hardware is 316 Marine Steel (resists salt). It is the ultimate outdoor pulley. Deck & Gear Friendly: The composite nylon shell is softer than steel. If it swings and hits your kayak, boat deck, or car hood, it won't chip the paint or leave a dent. Ultra-Lightweight: Perfect for portable gear, backpacking, or rigging on lightweight structures like tents and awnings. Common Uses: Marine: Kayak anchor trolleys, boat flag lines. Outdoor: Hanging bear bags (camping), tensioning sun shades. Home: Curtain tracks, light fixture suspension, garage organization.

• 【Premium 316 marine grade stainless steel】: Unlike standard 304 steel pulleys that rust over time, these Helffer blocks are crafted from high-quality 316 stainless steel hardware. This offers superior corrosion resistance against saltwater and humidity, making them the durable choice for outdoor marine rigging or sweaty garage gym environments.
• 【Heavy duty 880lbs (400kg) load capacity】:Engineered for serious lifting, each M50 double block features a reinforced frame and dual axles with a safe working load of 400kg per unit. They provide robust strength for creating 4:1 block and tackle systems to hoist engines, rooftop tents, or heavy weightlifting setups without deformation.
• 【Stable 180° pivot fixed head (non-swivel)】:Designed for precision alignment. The top U-shackle pivots 180 degrees to follow the rope angle but does not spin freely. This fixed-orientation design prevents the ropes from twisting around each other—a common frustration with swivel pulleys—ensuring a straight, tangle-free pull every time.
• 【Silent 50mm dual nylon wheels】:Experience strength without the noise. The large 2-inch high-density PA66 nylon wheels reduce friction and glide silently under load. They are ideal for DIY home gym projects like lat pulldowns, eliminating annoying metal grinding sounds while protecting your coated cables from wear.
• 【Versatile fit for 1/2 inch rope】:The widened U-groove channels accommodate ropes and cables ranging from 8mm up to 12mm (1/2 inch). Whether you are using paracord, braided marine rope, or gym wire, these double pulleys allow you to build efficient mechanical advantage systems for easier lifting.