Features:This item can use on Stainless Steel metal aluminium alloy wood plate. Thishole sawisespeciallydesignedto cutalloymaterial. Suitableto beinstalledontohandhelddrill tablemounteddrillor other drills. The holesaw hasa twistdrillbitinsidewhichisundetachable. When use this item add some water can extend life of the item. 1. When use this item the cutting material must be fixedit can not be moved it should be vertical to 90 degree to the drill bit2. When the central drill bit drill throught the borad please wait for a little while then drill the hole slowly3. When drilling the hole if you feel the drill bit is abnormal or the waste chip remove is not ideal please stop drilling. remove the chip then continue to drill the hole. PackageIncluded:1 Piece 53mm Carbide Tip T3 Hole SawDrillBit.