Mengshen 4-32mm Cobalt Alloy Step Drill Bit with Helical Flute, HSS M35 for Enlarging Holes in Hardened Steel Plates, Triangular Handle Drill Bit Set

Superior Hardness: M35 high-speed steel is harder than 4241 high-speed steel and is suitable for drilling stainless steel, steel, iron, aluminum, and wood. Optimal Design: The triangular shank fits perfectly into the power tool chuck to prevent slippage. The double-edged design removes chips more quickly and facilitates particle removal. The forked drill bit tip increases drilling speed. Automatic deburring during drilling keeps the drill bit clean. M35 high-speed steel step drill bits, 4-32 mm, 15 different sizes: 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 32 mm. Water cooling during operation extends the tool life.