EZARC Step Drill Bit for Metal, M35 Cobalt Spiral Flute Unibit (3/16'' 7/8'') Wear Resistant AlTiN Coated, 1/4" Hex Shank Stainless Steel, Aluminum, Plastic

【C-Profile Design】EZARC step drill bits feature a triple-flute design for increased stability, effectively reducing deviation during the cutting process. Additionally, the 'C-profile' cutting edge ensures smoother cutting and an increased cutting speed 【M35 HSS Step Drill】M35 cobalt high-speed steel, through heat treatment, achieves toughness and bending strength that surpass standard high-speed steel, making this step drill bit more suitable for cutting hard materials 【AlTiN Coating】Step bits coated with aluminum titanium nitride, rated at 89HRC for exceptional hardness and thermal properties. This coating offers superior resistance to heat, wear, and corrosion, with high adhesion and low friction 【Twelve Step Sizes】Spiral flute design offers seamless and effective drilling across various thicknesses, eliminating the need for multiple bits. Includes 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4”, 13/16", 7/8" 【Please Note】Material thickness: Suitable for metal sheet up to 1/8" (3 mm) thick and stainless steel sheet up to 1 mm thick. Add cutting oil or use coolant during continuous operation. Due to the larger cutting angles, the startup speed may be slower