box and tackle pulley picture Heavy-Duty Double Block System – 100Ft x 1/2'' Rope, 7700 LB(35KN) Breaking Strength, 4:1 Lifting Ratio – Ideal for Garage, Attic, and Heavy Lifting Applications Industrial & Scientific The breaking length of 12 mm rope is up to 35 kn/7700 lbs which can meet your different needs to a large extent Block and tackle - Wikipedia
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