Introducing our high-quality groove design drill bits, engineered for faster, smoother, and cleaner cuts. Crafted from premium high-speed steel with a titanium coating, these bits are exceptionally strong and durable, reducing friction and heat buildup for extended service life. The 118-degree split point tip ensures swift cutting, prevents slippage, and enhances wear resistance. Ideal for drilling through various materials such as steel, brass, wood, and plastic with precision and ease. Upgrade your drilling experience with these versatile and reliable drill bits today. Item Name: Step Drill Bit Material: High Speed Steel Color: Black/Gold Suitable For: Openings in Various Materials, Including Steel, Brass, Wood, Plastic Features: Groove Design, Heavy-duty, Professional Grade Size Details: A, L: 15.5cm/6.1", W: 12cm/4.72", H: 4.5cm/1.77" (Approx.) C, L: 15.5cm/6.1", W: 14cm/5.51", H: 4.5cm/1.77" (Approx.) D, L: 15.5cm/6.1", W: 14cm/5.51", H: 4.5cm/1.77" (Approx.) B, L: 15.5cm/6.1", W: 14cm/5.51", H: 4.5cm/1.77" (Approx.) E, L: 15.5cm/6.1", W: 14cm/5.51", H: 4.5cm/1.77" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: A: 5 x Drill Bits B,C,D: 6 x Drill Bits E: 7 x Drill Bits