... sheet,steel sheet,copper sheet,PVC coated sheet.Specification:the hole shape are rectangle,aquare,round,triangle,ellipse,are and so ... or nonmetal pieces. Punched openings can be round, square, triangle, diamond, hexagonal, cross, etc. The opening size, density and forms of ... .2mm to 20mm, thickness from 0.2mm to 10mm punching hole wire mesh