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HSS High Speed Steel Twist Drill Silver Set 25PCS. Extended Lifespan: Up to 12 times longer life than ordinary high-speed steel drill bits. Anti-Walk Design: Straight shank prevents walking or hovering for accurate centering. Versatile Material Use: Suitable for stainless steel, cast iron, copper, aluminum, wood, and plastic. Customizable Color: Available in any color the customer prefers. Diverse Packaging: Options include blister packs or color boxes. High Speed Steel: Made from durable HSS material for improved efficiency. Wide Application Range: Essential tool for industrial production and daily life. Fast Delivery: Offers rapid delivery services for customer convenience.