Three Diablo step drill bits with hex shanks and etched size markings; labeled “Swiss made” and designed for drilling multiple hole sizes in metal and plastic.
Packaged Diablo DSDS003 Impact Strong Step Drill Bit Set showing three labeled bits for metal and PVC; packaging highlights 6X longer life and 15% savings.
Close-up of a Diablo step drill bit actively drilling into a metal surface; conical shape and stepped design visible with emphasis on precision and durability.
Person using a power drill with a Diablo step bit to drill into a metal electrical box; metal shavings visible and drill engaged with surface, highlighting tool in use.
Three Diablo step drill bits with hex shanks and etched size markings; labeled “Swiss made” and designed for drilling multiple hole sizes in metal and plastic.
Packaged Diablo DSDS003 Impact Strong Step Drill Bit Set showing three labeled bits for metal and PVC; packaging highlights 6X longer life and 15% savings.
Close-up of a Diablo step drill bit actively drilling into a metal surface; conical shape and stepped design visible with emphasis on precision and durability.
Person using a power drill with a Diablo step bit to drill into a metal electrical box; metal shavings visible and drill engaged with surface, highlighting tool in use.
DIABLO

Diablo Step Drill Bit Set DSDS003 3 Piece 1/4 Inch Hex (High Speed Steel 132 Degree Split Point Sheet Metal Ductwork Electrical Hole Enlarging)

In stock
SKU: DSDD003
$96.00 USD
$102.94 USD Sale $96.00 USD

Description

Diablo Tools Logo

Diablo DSDS003 3-Piece Impact Strong High-Speed Steel Step Drill Bit Set 1/4-Inch Hex Shank

The Diablo DSDS003 3-Piece Impact Strong Step Drill Bit Set drills, enlarges, and deburrs clean knockout holes in sheet metal, steel studs, electrical junction boxes, and HVAC ductwork. Engineered with industrial high-speed steel and an impact-rated 1/4-inch hex shank, these stepped hole cutters deliver up to 6X longer tool life and 2X faster cutting speeds across high-torque impact drivers and rotary drills. Featuring a self-centering 132-degree split point tip to prevent bit walking, dual-flute chip evacuation channels, and permanent laser-etched diameter markings, this Swiss-made drill set equips electricians, HVAC technicians, and mechanical contractors with fast, burr-free hole production without pilot pre-drilling.

Best Used For:

  • Electrical Conduit Knockouts & Panel Fabrication: Drilling precise 1/2-inch, 7/8-inch, and 1-1/8-inch clearance holes for conduit fittings in steel breaker enclosures.
  • HVAC Sheet Metal & Ductwork Penetrations: Cutting clean round holes through galvanized ducting and sheet metal housings without material deformation.
  • Plumbing & Structural Steel Framing: Enlarging pipe clearance openings in heavy-gauge metal studs and durable plastic electrical distribution boxes.

Key Performance & Safety Features

  • 132-Degree Split Point Starter Tip: Initiates fast, self-centering hole starts instantly upon contact to eliminate bit walking and skip on slick metal.
  • Impact Strong 1/4-Inch Quick-Change Hex Shank: Absorbs high-torque stress in brushless cordless impact drivers and fits standard three-jaw drill chucks.
  • Accu-Grind Dual Flute Geometry: Maximizes chip evacuation and heat dissipation to prevent thermal binding and premature cutting edge dulling.
  • Optimized Increased Step Heights: Speeds up step-to-step hole sizing for standard trade-specific conduit, piping, and fastener diameters.
  • Permanent Laser-Etched Measurement Markings: Delivers instant step diameter readability inside dark panels that will not rub off during continuous friction.

What's Included

  • (1) Diablo 1/4" to 1/2" 6-Step Impact Drill Bit (DSD0500S06)
  • (1) Diablo 3/8" to 7/8" 12-Step Impact Drill Bit (DSD0875S12)
  • (1) Diablo 7/8" to 1-1/8" 17-Step Impact Drill Bit (DSD1125S17)
  • (1) Heavy-Duty Shatter-Resistant Jobsite Storage Case

Technical Specifications

Specification Detail
Model Number / Part ID DSDS003 (Step Bit Set)
Total Set Piece Count 3 Bits plus Storage Case
Drive Shank Interface 0.25 in (1/4 in) Impact Strong Hex Shank
Drill Tip Point Angle 132-Degree Split Point (Self-Centering)
Step Sizing Range Coverage 0.25 in to 1.125 in (1/4 in to 1-1/8 in)
Bit Base Material Industrial High-Speed Steel (HSS)
Flute Configuration Accu-Grind Dual Flute Geometry
Impact Tool Compatibility Cordless Impact Drivers and Rotary Drills
Manufacturing Country of Origin Switzerland
Total Packaged Weight 0.80 lbs (0.36 kg)
UPC Barcode Identifier 008925154396
Pro-Tip: Apply cutting lubricant when stepping through thick carbon steel or stainless sheet metal; keeping the Accu-Grind cutting edges cool maintains optimal cutting speed and prevents thermal hardening of the workpiece.