About This

• 【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 excellent corrosion resistance against saltwater and humidity, making them the durable choice for outdoor marine rigging or sweaty garage gym environments.
• 【Heavy Duty 880 lbs (400kg) Capacity Setup】:Engineered for serious lifting, each M50 double block features a reinforced frame and dual axles supporting a Safe Working Load (WLL) of 880 lbs (400 kg) and a Breaking Load of 3100 lbs (1400 kg). 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 highly suitable 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 highly efficient mechanical advantage systems for easier lifting.