T.C.T.(Carbide Alloy) Hole Saw can be used on portable electric, pneumatic tools and pillar drilling machines. Applications: Cut holes in comment steel plate,stainless steel plate...... Features: Separate arbor required. Cutting depth:1.6mm,3mm Advantage: Alloy 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.