Product Size:40*20*2.5mm Holes size:12mm Surface:Hot dip galvanized High quality & reasonable Price, can use repeatedly, wide usage range, flexible for installation. The size range that we can provide Standard size: width and height 20-300mm AOR Standard thickness: 1.0-10.0mm AOR Standard length:  AOR Angle Steel Advantages:   Easy installation  High strength to cost ratio High pressure intensity  Strut is re-usable  One-inventory adaptable to many jobs     A Few Endless Uses:  Automobile manufacture...Railway rolling stock...Elevator...Shelf...Transmission tower...Engineering machinery...Agricultural machinery...Construction industry...And so onC Channel Surface Finish:    Black iron Galvanized sheet the zinc layer 80-180g Powder coated- BS-6497-1984, between 60 and 85 microns thick Hot Dipped Galvanized-for outdoor use to BS EN 1461-1999, between 60 and 80 microns thick Acid Washing or Electrolytic Polishing- for stainless cable basket tray use