HSS STEP DRILL BIT 4-20 SALI

【HSS Titanium Coating】HSS 4241 & high-speed steel with titanium coating for strength and longevity. Coated by titanium, this step drill set performs well in heat, corrosion, and rust resistance.【Two-flute Spiral Grooved Design】The two-flute spiral grooved design deburrs chips, dust, and debris for clearance and smooth cutting.With 31 step sizes, each hole made with these step bits will be precise.