H.S.S. Hole Saw can perforate any hard material plate. Can be used on portable electric, pneumatic tools and pillar drilling machines. MATERIAL: M2 HSS STEEL HEAT TREATMENT: 63-65 degree centigrade Applications: Cut holes in stainless steel plate, F.R.P. Copper plate, Iron plate, Brass plate, Aluminum plate and other hard land compound metallic plates. Features: Separate arbor required. High speed steel cutting edge. Cutting depth:1.6mm,3mm Advantage: HSS teeth for longer life. Faster and smoother cuts. Better swarf clearing away. Teeth stay sharper longer. Cutting safely and efficiently. Perforate any hard material plate. Specifications: The sizes from 12mm(1/2")~150mm(6"). From12-150mm. From12-17mm in steps of 1mm. From17-22mm in steps of 0.5mm. From22-70mm in steps of 1mm. From70-150mm in steps of 5mm. Other sizes available by request with arbor and center drill.