Cross the role of fixed hand chain hoist is the top, should bear the greatest force, so the general steel material. When used in the cross with the screw screw in the top of the column truss, and then hanging above the chain hoist, hand chain hoist and then buy the beam light frame. (Chain hoist: is a truss, a head of a cross, when pulling the chain hoist when the truss can be pulled up.
Color: usually silver gray, no designated color uniform silver gray (other colors can be sprayed according to customer requirements).
Surface: the use of electrostatic powder coating, pipeline operation, no rust, Diaoqi, spraying thickness of 15-20cm (steel pipe surface to do rusty) with outdoor plastic powder for spraying, with anti-sun and rain protection function.