Slotted taper and deburring countersinker set comes in polystyrene case. It is ideal for burr and chatter-free deburring and countersinking. Applicable for steel, cast iron, non-ferrous and light metals. Best results at low cutting speeds. Countersink with a blade not recommended for full countersinking. Peeling cut, chip removal through the slot prevents chips from clogging the workpiece.