1、UPGRADE MATERIAL: Rope hoist pulley system with rustproof galvanized housing, nylon roller with forged hoist cable hook, rustproof, durable than plastic housing; The strong nylon rope puller ensures that will not break or be damaged under the harshest conditions 2、HEAVY LOAD CAPACITY: With a breaking strength of 4,400 pounds and a load cover block and tackle system of 1,100 pounds, this heavy duty crane can lift heavy loads and weights; There is no need to worry about damage caused by excessive load 3、IMPROVED LIFTING CONVENIENCE: The 8:1 lifting power of the block and hoist system minimize the amount of work required when lifting, allowing you to lift heavier things; And you can do all the work with blocks and tackles without electricity or help 4、WIDE APPLICATION: Perfect lifting pulley system for athletes, disabled people or people with back problems, can also be used for other applications, such as hunting, boating, lifting, garages, pets, cutting trees, DIY lofts, etc. 5、STURDY MATERIAL: Heavy duty rope hoist pulley system is made of alloy steel material, with high strength, high toughness, wear resistance, corrosion resistance, high and low temperature resistance