DEWALT DT5027-QZ HSS Step Drill Bit 4-12 mm, 9 Steps, TiN Coated, Hex Shank

Electricians, plumbers, and metal fabricators often need to enlarge or deburr holes in sheet metal, plastic enclosures, or thin-wall tubing without switching bits. The DEWALT DT5027-QZ step drill bit tackles these jobs in one pass: its 9-step profile covers 4 mm to 12 mm in 1 mm increments, so you can drill, step, and deburr with a single tool. The titanium nitride coating reduces friction and heat, while the split point starts on contact without walking, even on smooth surfaces.

Key specifications

• Drill bit type: Step drill bit
• Material: High-speed steel (HSS) with titanium nitride (TiN) coating
• Diameter range: 4–12 mm (9 steps, 1 mm increments)
• Shank: 1/4" (6.35 mm) hex for quick-change chucks
• Overall length: 75 mm
• Point type: Split point for self-centering
• Flute type: Spiral flute for efficient chip removal
• Suitable for: Metal, plastic, wood, non-ferrous metals
• Packaging: 1 piece

Why choose it

The hex shank locks securely in impact drivers and cordless drills, eliminating slippage under torque. The TiN coating extends bit life and keeps cutting edges sharp when working on stainless steel or aluminium. The split point reduces the need for centre punching, and the step design deburrs the hole as you progress—saving time on finishing work.

Ideal use cases

• Drilling clean, burr-free holes in electrical panels and junction boxes
• Enlarging existing holes in sheet metal ductwork or automotive body panels
• Creating precise holes in plastic enclosures for cable glands or connectors
• Deburring and chamfering holes in thin-wall tubing

Good to know

For best results, use a slow to medium speed and light pressure when drilling metal. The step drill bit is not intended for masonry or concrete. Always wear safety glasses and secure the workpiece before drilling.