Aluminum Alloy Screws Sleeve Block

The role of the square sets is used to connect the column aluminum alloy light frame and the beam aluminum alloy light frame, when pulling the square with a chain hoist, you can drive the beam up and down to move. The square is provided with a pulley so that the square can slide vertically along the direction of the column. Square sets are different from the six-sided joints, six-sided joints can not be connected up and down after the beam, and Fang sets can be moved.