HSS Spiral Groove 4-12,4-20,4-32mm Step Drill Bakeng sa ho sebetsa ka tšepe
1.Spiral Groove Design e etsa hore ho tlosoe chip ka potlako.
2.E loketse likoti tsa ho cheka linthong tse sa tšoaneng: ka hare ho 3mm / 0.12 inch (Iron Plate, Copper Plate, Aluminium Plate); ka hare ho 5mm / 0.2 inch (Lehong, PVC sheet, Insulation Boards).
Ngola molaetsa wa hao mona mme o re romele wona