1.Material:Surper low carbon 2.Hole Size:6mm round 3.NC machinery anufacture 4.Anti-corrosive oil,steel belt ... 5.low price Specifications1) Hole shape: square, round, oblong, triangle 2) Thickness: 0.3-3.0mm 3) ... : mild steel, galvanized steel, stainless steel, aluminum, brass etc. Hole style: round, rectangular, elliptical, diamond,hexagonal, cross, slotted, star, plum blossom, other ...