Easy to replace the blades when it begins to dull.drilling stably,small incision resistance,high speed,do not breaking the border. the item great for removing spot-welded panels or metal sheets without distorting the metal or damaging the underlying panel,alleviates the need to pry and break welds This weld cutter is double sided rotary cutter blade separates spot-welded panels more effectively than a panel cutter.Double sided 3/8 inch rotary blade and Hex Shank fit most drills The double-sided blade is made of heat thicker steel in high standards,which quickly separates spot-welded panels without distortion,High strength and hardness.The Center pin on the bit is spring loaded Spot weld cutter drill bit for easily separate spot-welded panels without distorting the sheet metal. Separate Spot-welded sheet metal, panel, etc and cut small access holes double-sided blades. Suitable for thin stainless steel sheets, iron sheets, aluminum sheets, F.R.P or other thin metal sheets, Manufacturer: Littimoon