Features Unique 3 Sided Shank Design: Prevents slipping and reduces impact, ensuring stability during drilling and extending the service life of the bit Optimized for High-Speed Drilling: Enhanced slot design allows for greater speed and control, minimizing debris and ensuring cleaner cuts on various materials Versatile 10 Size Options: Equipped with 10 different sizes, this bit enables you to create multiple holes without the need for constant bit changes, saving you time Impressive Drilling Depth: Capable of penetrating materials up to 0.07in thick, including steel, acrylic, PVC, and wood, for versatile applications in various projects Durable High Speed Steel Construction: Designed for maximum durability and efficiency, featuring a new spiral slot that cuts quickly and automatically deburrs while drilling Features: 1、Unique 3 Sided Shank: Compared with traditional drills, spiral step drills are nearly impossible to buckle. The unique 3 sided shank prevents slipping into the drill chuck and reduces impact, which is recommended to lubricate the drill before each use to extend service life. 2、Design Optimization: The spiral step drill bit slot design and the 3 side shank design are optimized for high speed cordl drilling rigs, providing greater speed and control, while minimizing the flying of steel plates, thereby prolonging the service life. 3、10 Size Drill Bits: The spiral step drill bit has 10 sizes, so you can drill 10 holes according to different diameters, which saves you the time and effort to replace the drill bit. 4、Drilling Depth: The drilling depth can be as high as 0.07in (about 0.2 cm) of steel plate, acrylic, PVC, and wooden boards within 0.2in (about 0.5 cm). 5、Robust High Speed Steel Structure: The spiral step drill bit with strong high speed steel structure is adopted to improve durability. The new spiral slot design cuts faster and straighter, and can automatically deburr when you drill. Specification: Item Type: Spiral Step Drill Bit Material: High Speed Steel Purpose: Spiral Step Drill Bit Colour: Dark Yellow Tool Handle Size: 3/8in Drilling Range: 1/4in-1-3/8in Step Size: 1/4in, 3/8in, 1/2in, 5/8in, 3/4in, 7/8in, 1in, 1-1/8in, 1-1/4in, 1-3/8in Scope of Application: Use with Pistol Drill or Electric Drill Package List: 1 x Spiral Stepped Drill Bit Note: Please do not set the drilling speed to the maximum value to avoid damaging the cutting edge. Package List 1 x Spiral Stepped Drill Bit