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5mm (3/16") thick heavy-duty backing plate eliminates need for drive plate
Do not sink the burr for more than one third of its periphery
or by machine using a floating die holder
Canada and the UK
5 Pce 10-31mm 90 Degree HSS Co5 Triple Flute Countersink Set 5mm (3/16") thick heavy-duty backing5 Pce 10 31mm 90 Degree HSS Co5 Triple Flute Countersink Set Triple flute countersinks are ideal for countersinking and deburring in a wide range of materials including ferrous and non ferrous metals. The three fluted countersink is self centering with wide flutes and is used to provide a heavy chamfer in the entrance to a drilled hole. This may be required to allow the correct seating for a countersunk head screw or to provide the lead in for a