[230 in 1] High Speed Steel Titanium Twist Drill Bit Set for Steel, Wood, Plastic, Metal, Copper, Aluminum Alloy with Storage CaseThis 230 piece drill bit set features high speed steel bits with a durable titanium coating, ensuring long lasting sharpness and resistance to deformation. Each bit has a precise 135 split point and a gold oxide finish to prevent walking and enhance cutting accuracy. The two flute design efficiently clears chips and reduces heat buildup, making drilling faster and smoother across materials like steel, wood, plastic, copper, and aluminum alloy. Ideal