... .2-30mm 3.ISO9001:2008 4.All shapes hole punched steel/aluminum panel factory1.Hole Diameter:0.3-500mm2.Plate Thickness:0.2 ... 4.Material:Low carbon steel, stainless steel, stainless steel, aluminum steel, plywood, hip board, density board, plastic film, etc.5.Hole shapes:Round, rectangular, square ...