RUKO Step Drill Bit HSS-Co 3/16 inch-7/8 inch (4.8-22.2 mm), 12 Steps, 3-Flat Shank

Step drill bit with a diameter range of 3/16" to 7/8" (4.8–22.2 mm) in 12 steps, made from HSS-Co for high-performance drilling in sheet metal and thin materials.

Overview

The RUKO STB-HSSCo step drill bit is engineered for precision drilling, deburring, and reaming in sheet metal, non-ferrous metals, plastics, thin steel, and stainless steel. Its self-centering 118° point angle ensures accurate hole positioning without a pilot drill.

What stands out

• HSS-Co (cobalt alloyed high-speed steel) for enhanced heat resistance and durability
• 12 steps with 1/16" (1.59 mm) increments cover a wide range of hole sizes
• 3-flat shank prevents slipping in the drill chuck
• Uncoated bright finish for clean cutting performance
• Right-hand cutting direction for standard drilling applications

Technical details

• Drill bit type: Step drill bit
• Material: HSS-Co
• Diameter range: 3/16"–7/8" (4.8–22.2 mm)
• Number of steps: 12
• Step increment: 1/16" (1.59 mm)
• Shank type: 3-flat shank
• Shank diameter: 10 mm
• Total length: 95 mm
• Max material thickness: 4 mm
• Point angle: 118°
• Coating: Uncoated (bright finish)
• Cutting direction: Right-hand cut
• Standard compliance: DIN 1412 C

Our verdict

A versatile step drill bit for professionals and DIY enthusiasts working with thin materials, offering a broad diameter range in a single tool.