Features Unique 3 Sided Shank: The innovative 3 sided shank design prevents slipping into the drill chuck, reducing impact and the likelihood of buckling, while also requiring lubrication before each use to extend service life. Design Optimization: The slot and shank design are optimized for high speed cordless drilling rigs, delivering greater speed and control, minimizing steel plate flying, and prolonging the service life. 10 Size Drill Bits: With 10 different sizes, this spiral step drill bit saves time and effort by allowing drilling of multiple holes without the need to replace the drill bit. Drilling Depth: Achieve a drilling depth of up to 0.07in (0.2cm) in steel plate, acrylic, PVC, and wooden boards within 0.2in (0.5cm). Robust High Speed Steel Structure: The strong high speed steel structure enhances durability, while the new spiral slot design ensures faster, straighter cuts and automatic deburring. 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 cordless 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