Advantages: 1, gear: durability standards of international gear steel is twice the normal chain pulley block, the rotation is more stable and hand pull lighter; 2, Chain: high-strength chain; suddenly overweight adapt working conditions, to change the ordinary chain pulley block Only vertical drop down for a wide range; 3, Hook: very high strength materials, higher safety factor; hook tongue is a new design for the hook to ensure that the goods are not decoupled; 4, limit switches: There are two upper and lower limit switch hook portion prevents chain fled ensure safety; 5, housing: it is pressed from high quality steel, is made of solid steel; 6, overall: perfect design, modern, elegant, beautiful appearance ergonomic, scope and activities of this machine compact body.