Features: * brand new and high quality *Application: T20 short rail for trapezoidal sheet PV mounting. on walkable trapezoidal sheet metal roofs with sheet metal outer skin. *Material T20 profiles: aluminum alloy AL6005-T5, 1.00 KN *Requirement - trapezoidal sheet minimum sheet thickness steel 0.5mm / aluminum 1.00mm. *Good static load distribution. This type of installation reduces the suction effect on the outer skin of the roof covering by the weight of the PV system. *No transport of long profile bars - adjusted to the bead spacing of the profile sheets. *The profile sections are pre-punched and covered with sealing tape. Assembly 1. Roof division depending on module dimensions 2. Align the first row using a chalk line. 3. Place the T20 holder in position, pre-drill with a ? 5.00 mm sheet metal drill and fasten with 4 blind rivets. Alternatively: fasten with thin sheet metal screws without pre-drilling. 4. Place the next rows using a wooden template. After 10 rows check the direction again with a piece of string. Details: *Material: Aluminum alloy *Color:silver Style: 4x rails + 4x end clips Rail Size: 200mm Middle clip: for solar panel 30mm, for solar panel 35mm End clip: for solar panel 30mm, for solar panel 35mm Note：Middle clips and end clips purchase the corresponding size set according to the thickness of your solar panel Package Contents: 4x Rails （with accessories Gasket+Screw）+ 4x end clamps Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.