HSS Spiral Groove 4-12,4-20,4-32mm Gradus EXERCITATIO Metalli operandi
1.Spiral Groove Design celeri chip remotionem facit.
2. Apta terebra perforata in variis materialibus intra 3mm/0.12 inch (Platea ferrea, Plate Copper, Aluminium Plate); intra 5mm/0.2 inch (Wood, PVC sheet, Insulation Board).
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