M35 step drill bit in high-speed steel 4-20 mm, conical bottom drill bit set, cobalt alloy helical point reamer, cobalt triangular shank drill bit, countersink bit

Superior Hardness: M35 high-speed steel provides superior durability compared to other drill bits, while the cobalt alloy allows for easy drilling through steel, aluminum, copper, plastic, wood, and many other thin metals. Optimal Design: The triangular shank securely attaches to the power tool chuck, preventing slippage. The double-edged design allows for faster deburring and easier chip removal. The forked tip increases drilling speed and automatically removes burrs during drilling, keeping the drill bit clean. Water cooling is available during operation, extending its lifespan. An Essential Tool for Homeowners, DIYers, and Professionals: Ideal for household repairs and light-duty work, such as drilling holes in plastic, aluminum, copper, and many other thin metals, including stainless steel and steel. Quantity per shipment: 1 piece * 4 to 20 pieces.